Freight went official for the 119th Update, yes. All the materials from Freight are in the gcf and everything (which is only the models and the textures that go with them)
I'm assuming this is OP's first crack at mapping, and I think you're doing a pretty good job with it with that in mind! However, keep a few things in mind:
While part of TF2's humor specifically revolves around how close RED and BLU's bases are to each other, the bases rarely share the same building. Why would a BLU building be connected to a RED one? Though with proper context it can obviously work (see 1fort), there doesn't seem to be much of a reason why that BLU building is connected to a RED one. On top of that, the severe contrast can look rather unappealing to players.
Color is a very, very important thing in Team Fortress, because it specifically denotes the territory you're in and where you're going. If you can't tell if you're in friendly territory or not, you're going to get very confused (and probably pretty angry!) players.