Its another opportunity to let one's imagination have fun, and no-one will be able to tell you that you've got the detail wrong :)
As hapens so many times in wargaming, Hobby Craft and Halfords are your friend, with lightweight metal gause making ideal mesh screens and corrugated cardboard just perfect for that "found in the scrapyard" applique armour look.
I have a bag of cars left to do, and I often take a look in the toy aisle when I'm doing the weekly grocery shop to see if there's any new cars or buggies that look useful. The main things I'm looking for just now are a bus and petrol tanker for a "Mad Max 2" finale kind of scenario. Oh and rules. Oh, and figures! (and an autogyro would be nice too!)
Any suggestions for those most gratefully received :)