Funny that you listed that Phil, I'm working an a cardboard 1/6 Ba-10 as I sit here tonight.
Going back to the original question, the Bronniford is a biggish lump of Russian (converted from Ford) metal and has the distinction that if you type it into Google you get no references! I managed to find this photo though:
My source says it weighs 5.2 tons, 85HP engine, 4 crew, 15mm max armour, 35mph max speed, 1x45mm gun and 1 mg. It didn't state the wheel size though, but you will need at least 12!
Phil "obscure sources of reference" Palmer