convert a Panzer IV into one. The road wheels and tracks are not that far off. it's just a matter of taking the basic body and modifying a bit with some plastic card.
Come to think of it maybe I'll take my own advice.
We're in the process of designing a new turret to take a stabilized 40mm cannon on the 1/1 scale Warrior. Design in an upgrade path for yours so you can upgrade in 2014 to keep up to date with the real thing. It looks much better than the existing one with its peashooter.