Bubba:

That 540 powered one is tall, yes. Too wide 'cause it was designed for the King Tiger, 5604/56004 I believe.

Going from memory, if the 540 gearbox is too tall (yes I know its too wide) you're going to be SOL on the RT1601 boxes too, they are even taller.

Let me dig out the Leopard boxes tomorrow and the sherman, and I can take some measurements.