I could use your help. I used to be able to use 3D Studio decently, but it's been a while. I got a model of Minas Tirith (LOTR geek here) and upon using it in TG, I discovered that only part of it was partially complete, and it needs to be fixed in a 3D modeling program. Basically, it just needs some new faces, but I can't remember or know how to fix it.
Edit: the file's too big, I'll upload it somewhere else and link here, hang on