First, some errors I get when running the map in my server:
G_PickTarget called with NULL targetname
G_PickTarget called with NULL targetname
FinishSpawningBuildable: team_human_mgturret startsolid at (832 -608 128)Some pictures now:
(I don't know if you already fixed any)
[
Edit: UPDATED]
Small texture overlap:

Need NoDraw:

Ugly tubes:

The worse texture overlap I've ever seen:

Again, from another angle:

Why do we need that semi-transparent yellow brush in the ceiling?

[
Edit: Fixed] Small detail:

I think you could put some NoDraw there (not sure if you want to do it):

Broken buttons (all buttons from those small tanks seems to be broken):

Broken buttons again:

That room has some texture problems specially if looking from this angle (it doesn't appear in the picture however):

[
Edit: Fixed] Your subway is not synchronized with the doors:

[
Edit: Fixed] Your subway is not synchronized with the doors (another pic):

What to do if I fall into the train tunnel? That is why I told it is unplayable. It is a long way to get to the first door, and the train will try to push you back:
