maybe someone remembers an older project of mine which was also an editor but written in c#
i think about writing some kind of editor for visual studio
use the power of visual studio for editing 3d worlds. the 2012 version of visual studio contains an fbx and obj editor so i think it shouldn't be that hard to create some level editor in it

but this is future sound (i'll need to do research and stuff but i think it will be possible)