lol you call that a messy mesh? looks pretty clean to me. the only issue is that you got quite a few tri's here and there and a lot of poly wasteage on the roof. but those are minor issues i guess.
the tris are ok if they dont screw with the mesh, aand at most points you can get away with a tri at the end of a poly row... (most cases) flat surfaces accept them.
Small update. Been working on an environment and a simple interior - not going to do the full interior, only enough to not have to use dark windows. Also working on wheels, which should be in next post.