The non-erlang-resources are available in the normal resource workspace. We don't provide a one-to-one mapping between the resource workspace and the erlang model, but the erlang model is mostly a subset of the former. So far this has been a useful and reasonable approach.
There are some missing features:
- model change notifications
- syntax tree handling

Yes, but they are present in the Erlang model, too -- IErlFolder is a part of the model and there are such elements created for all folders in the project, even those unrelated to the Erlang parts. This means that navigating the model has to filter out these elements every time.

Since the project's properties say which folders are source folders, why should we traverse all of them when looking for the modules?

In the outline, the source folders should be visible as children of the project (just like for Java projects) and with special icons.

And so on, and so on...

Updating tickets (#217, #218, #219, #220, #221, #223, #224, #229, #239, #240, #241, #244, #245, #261, #265, #274, #278, #280, #281, #283, #285, #298, #307, #318, #326, #331, #332, #335, #336, #338, #342, #348, #216, #237, #247, #255, #264, #277, #321, #328, #113, #114, #129, #131, #211, #222, #231, #242, #256, #323, #325, #150, #172, #252, #276, #291, #294, #316, #317, #339, #340, #343, #44, #195, #234, #249, #313, #314, #344, #228, #160, #173, #235, #238)

Updating tickets (#194, #200, #208, #217, #218, #220, #221, #224, #229, #241, #245, #252, #261, #265, #274, #276, #278, #280, #281, #283, #285, #291, #294, #298, #307, #316, #317, #318, #326, #331, #332, #335, #336, #338, #339, #342, #343, #348, #56, #69, #87, #106, #144, #166, #195, #198, #234, #255, #264, #277, #313, #328, #344, #123)

Updating tickets (#384, #389, #396, #64, #291, #352, #358, #393, #398, #399, #41, #46, #52, #57, #61, #83, #93, #100, #111, #115, #135, #145, #148, #149, #152, #155, #159, #163, #181, #182, #194, #200, #208, #217, #218, #220, #221, #224, #229, #261, #265, #274, #280, #281, #283, #285, #294, #298, #307, #316, #318, #331, #332, #335, #336, #338, #348)

Updating tickets (#134, #40, #100, #114, #120, #129, #131, #137, #156, #157, #179, #211, #222, #228, #231, #326, #379, #455, #459, #41, #46, #52, #61, #64, #76, #83, #93, #95, #111, #115, #119, #130, #135, #145, #149, #152, #155, #159, #163, #164, #168, #170, #172, #181, #194, #200, #208, #218, #220, #223, #224, #241, #245, #252, #261, #265, #274, #276, #280, #281, #283, #285, #294, #298, #316, #317, #318, #331, #332, #335, #336, #339, #351, #364, #366, #372, #375, #377, #380, #385, #394, #398, #405, #413, #415, #418, #422, #423, #424, #425, #429, #430, #436, #437, #440, #442, #443, #445, #446, #448, #449, #452, #454, #461, #464, #471, #44, #56, #69, #87, #98, #106, #144, #166, #195, #234, #255, #264, #313, #328, #359, #387, #421, #428, #439, #463, #123)

Updating tickets (#134, #40, #43, #80, #100, #113, #120, #129, #131, #137, #156, #157, #179, #211, #222, #228, #231, #242, #326, #349, #379, #451, #455, #459, #523, #524, #530, #41, #46, #52, #58, #61, #62, #64, #76, #83, #89, #93, #95, #115, #116, #119, #121, #130, #135, #145, #149, #152, #155, #159, #163, #164, #168, #169, #170, #175, #181, #182, #188, #194, #199, #200, #205, #208, #210, #218, #219, #223, #224, #235, #237, #238, #239, #240, #241, #244, #252, #261, #265, #274, #276, #281, #283, #285, #294, #298, #316, #317, #318, #331, #332, #335, #336, #339, #340, #351, #354, #358, #364, #366, #372, #374, #375, #377, #378, #380, #383, #392, #394, #398, #405, #407, #410, #411, #412, #413, #415, #418, #422, #423, #424, #425, #427, #429, #430, #432, #436, #437, #438, #440, #442, #443, #445, #446, #447, #448, #449, #450, #452, #454, #460, #464, #465, #470, #471, #474, #477, #478, #479, #483, #484, #492, #493, #494, #495, #497, #498, #499, #506, #508, #510, #511, #512, #514, #515, #516, #517, #519, #521, #536, #537, #540, #541, #542, #543, #545, #546, #42, #44, #53, #54, #56, #67, #68, #69, #84, #87, #98, #99, #101, #106, #117, #118, #132, #144, #160, #166, #195, #216, #234, #249, #255, #264, #313, #314, #321, #328, #359, #387, #416, #419, #421, #428, #439, #463, #485, #488, #489, #528, #59, #123, #433)

Updating tickets (#503, #529, #40, #43, #120, #157, #179, #211, #222, #228, #326, #379, #451, #459, #523, #524, #530, #559, #535, #176, #177, #386, #389, #409, #434, #473, #41, #52, #62, #64, #83, #93, #115, #135, #145, #149, #155, #159, #163, #181, #194, #199, #200, #208, #210, #219, #224, #261, #265, #274, #281, #283, #285, #294, #298, #316, #318, #331, #332, #335, #336, #358, #375, #383, #394, #398, #412, #413, #415, #422, #423, #424, #425, #432, #440, #442, #443, #446, #448, #449, #450, #452, #454, #460, #464, #471, #474, #479, #483, #484, #492, #497, #506, #510, #512, #516, #519, #521, #536, #537, #541, #543, #546, #555, #556, #561, #564, #565, #291, #431, #502, #520, #522, #532, #469, #42, #44, #69, #87, #132, #195, #234, #255, #264, #313, #387, #419, #421, #428, #439, #488, #489, #558, #123, #433, #80, #113, #137, #242, #349, #455, #46, #58, #61, #76, #89, #95, #116, #121, #152, #168, #169, #170, #175, #188, #205, #218, #223, #237, #240, #241, #252, #276, #317, #339, #340, #351, #354, #364, #366, #372, #374, #377, #380, #405, #407, #410, #429, #430, #436, #437, #438, #445, #447, #470, #477, #478, #493, #494, #495, #498, #499, #511, #545, #548, #562, #563, #373, #401, #475, #560, #53, #84, #98, #99, #106, #117, #118, #166, #216, #249, #314, #321, #328, #359, #463, #485, #134, #100, #156, #427, #554, #551, #552, #550, #553, #129, #131, #231, #114, #323, #325, #119, #130, #164, #182, #235, #238, #239, #244, #378, #392, #411, #465, #508, #514, #515, #517, #557, #54, #67, #68, #101, #144, #160, #416, #528)

Updating tickets (#737, #242, #364, #373, #411, #473, #561, #218, #339, #358, #422, #423, #424, #425, #428, #432, #535, #543, #599, #636, #671, #684, #693, #694, #699, #41, #52, #64, #83, #93, #120, #149, #157, #163, #177, #179, #194, #195, #219, #222, #228, #261, #274, #281, #283, #285, #298, #318, #335, #349, #351, #375, #379, #383, #401, #405, #409, #412, #413, #434, #442, #449, #450, #451, #454, #460, #471, #492, #523, #537, #555, #559, #574, #577, #581, #598, #603, #615, #619, #632, #634, #639, #640, #641, #642, #643, #645, #658, #660, #662, #664, #665, #667, #673, #674, #679, #685, #695, #696, #700, #705, #707, #709, #716, #719, #720, #722, #728, #736, #738, #741, #743, #744, #746, #759, #760, #761, #762, #766, #767, #768, #769, #770, #771, #772, #773, #774, #775, #776, #779, #780, #786, #788, #789, #790, #791, #159, #372, #443, #479, #564, #601, #610, #622, #677, #429, #489)

Updating tickets (#560, #613, #737, #41, #52, #64, #83, #93, #120, #149, #157, #159, #163, #177, #179, #194, #195, #218, #219, #222, #228, #242, #261, #274, #281, #283, #285, #298, #318, #335, #339, #349, #351, #358, #364, #372, #373, #375, #379, #383, #401, #405, #409, #411, #412, #413, #422, #423, #424, #425, #428, #429, #432, #434, #442, #443, #449, #450, #451, #454, #460, #471, #473, #479, #489, #492, #523, #535, #537, #543, #555, #559, #561, #564, #574, #577, #581, #598, #599, #601, #603, #610, #615, #619, #622, #632, #634, #636, #639, #640, #641, #642, #643, #645, #658, #660, #662, #664, #665, #667, #671, #673, #674, #677, #679, #684, #685, #693, #694, #695, #696, #699, #700, #705, #707, #709, #716, #719, #720, #722, #728, #736, #738, #741, #743, #744, #746, #759, #760, #761, #762, #766, #767, #768, #769, #770, #771, #772, #773, #774, #775, #776, #779, #780, #786, #788, #789, #790, #791)

Updating tickets (#802, #52, #64, #460, #720, #749, #769, #775, #776, #786, #851, #83, #93, #149, #157, #163, #179, #194, #195, #222, #228, #274, #281, #283, #285, #335, #339, #349, #351, #358, #364, #373, #375, #379, #383, #401, #405, #409, #411, #413, #422, #424, #425, #428, #434, #442, #443, #449, #450, #454, #471, #479, #492, #523, #535, #537, #543, #561, #564, #574, #590, #598, #599, #603, #610, #615, #619, #632, #634, #636, #639, #640, #641, #642, #643, #645, #658, #660, #662, #664, #665, #674, #677, #684, #685, #688, #689, #693, #694, #695, #696, #699, #700, #707, #709, #719, #736, #743, #744, #746, #748, #759, #760, #761, #762, #774, #778, #780, #788, #789, #796, #798, #799, #800, #803, #809, #812, #813, #816, #820, #822, #829, #836, #837, #840, #841, #842, #848, #849, #850, #853, #854, #855, #856, #857, #860, #867, #868, #871, #872, #873, #875, #41, #159, #372, #429, #489, #577, #601, #622, #667, #679, #767, #768, #772, #785, #771)

Updating tickets (#156, #747, #805, #806, #972, #194, #274, #335, #339, #375, #603, #610, #641, #642, #664, #665, #684, #743, #744, #759, #760, #762, #796, #800, #809, #820, #853, #856, #857, #884, #893, #900, #902, #916, #917, #953, #969, #990, #1002, #1003, #1004, #1011, #1012, #1044, #40, #119, #121, #129, #130, #145, #160, #244, #264, #265, #387, #392, #433, #454, #459, #463, #479, #508, #524, #529, #536, #589)