Sorry for the threadomancy but I just saw these tanks at the Revell website. They are Snap-Tite, but are exceptionally cheap, scaled 1/48 and may be a good way to build up some armor for your G&P project. Even though the 3 currently available aren't perfect matches to the teams' rides, I think with a suitable PJ (over the garish prepaints) I can make do for the price ($13.95US). Then I can do it in the scale I want with some delicious Statuesque Miniatures figs to crew them.
Currently a Sherman, Panzer, and Patton are the only offerings.