I guess you're right, I'll have to reskin modules... but I'd rather not to: when I played The Jedi Masters, I found every reskinned module to be too distracting. Of course I understand we don't have a complete toolset to work on modules, but I think it's very important to find a way to get this right. I don't want to be too ambitious, so I think I'll give doing a module from scratch another chance and, if I find it to be impossible, I'll take your suggestion and just reskin modules.
So far, I've been able to use simple meshes and .3ds objects in a module. I think paths could be added with a bit of work, lightmaps I'm not sure. My current problem is camera collision is missing and I don't know how to set it, I can't find one tutorial on this
UPDATE: I've been able to fix the camera issue and the bugs I mentioned before. First of all, i ditched kaurora for mdlops, then I tried merging the walkmesh with a box representing the wall and it worked! 😀