Just before you walk away from this project, can I suggest you get a few 20' containers as terrain items? They turn up quite often here and there, and a couple of containers on the table are good, instant blocking terrain as well as a player magnet - every time they're convinced there's great stuff hidden inside, even when they're full of zombies!
I'm a fan of them in modern wargames, got them in 28mm (5) and 20mm (17) sizes - put a whole load on the table, a road and a portakabin and suddenly you have a container park/storage facility.