This looks good and I agree with you on the way you don't care about how the roof looks, It just really doesn't matter enough to me to make something no one will see during their game look good.
it looks nicely done, but there are some places like on the roof where you could have used interlocking, you could perhaps clean that up in a V2 or sumthin, coz i think its a good idea
i love the idea and the use of vehicals, the roof looks cool but a bit sloppy here nd ther but in all looks really fun