I did a little run-through of the map, and I have some things to note.
First, the trains have no warning bells. You should probably add some so people won't suddenly get run over by trains that seem to appear from nowhere
Second, it seems most of the inner base is made up of long hallways with the occasional room, like 2fort's inner but much bigger. It also feels that it takes a while just to get to the intel room, mostly because the hallways seem to twist and turn at serveral points. This is only my point of view, so you probably want to test it with others