Ok, so sometimes I change my mind. At least I didn't finish the piece. I like the SU122 idea, but I've been wrestling with the notion that it doesn't look like it will carry a bunch of boys. Then a ran across this beauty:
This is an SU-14 BR2. I big, it's ugly, it so orky. A few modifications to allow for doors and big assed wheels and I think we're good.