The radiators themselves weren't the problem, it was their placement, which was occasioned by the cramped nature of the engine compartment vis a vis the donk placed inside it. Bunging the radiators ar the front and therefore at the opposite end of the tank meant plumbing running the length of the beast and the water in radiators does get rather warm (don't try this at home).
I briefly toyed with bodging the bridgelayer variant up from a Crudader kit. It's the only version that saw actual operational service (Australians at Tarakan in 1945) it would be essentially a terrain feature that saw action once and a bloody complicated one to scratchbuild at that so I nixed that idea quick smart.
Very nice work btw.