I'd agree with pretty much everything cerious said there, bring the L shaped wall back a bit and give it a bit more of a logical reason to be there, right now it looks out of place, bring the crates back a max of 128 and reduce the amount of sheet metal on those ledges by 1/4.
Overall this looks excelent, I haven't played it for a while but its on my list to play!
I think that's more than possible already. I can always shrink the track into the floor and hide the wooden crossbeams.One suggestion that came up on gameday, was that you found some payload tracks like the ones on well (but of the correct size of course), so that they didn't have any wooden crossbeams on them. This would fit the theme of the map much better. I believe Buzzy made some of these a while back but I'm not sure if he ever released them, and I haven't seem him online recently. I just checked and they're not in the models forum.