The cooling system.
As previously mentioned, there were three engine configurations on the Maus V2. As it came from the factory and identical with the other prototype, the V1, the generator was driven by a Daimler-Benz MB 509 gasoline engine, a modified DB 603 aviation engine. This was then converted to Diesel fuel. And finally they changed the engine to a Daimler-Benz MB 517, also Diesel powered.
I made a quick sketch of the cooling compartments as viewed from above to try and explain.
The initial cooling arrangement (for the gasoline powered MB509) was mirrored, both sides being "A". When they switched the fuel to Diesel it was "A" plus "B", just like in the drawing, and finally, with the MB517, it was "B" on both sides. The freed up space at the front was used by enlarged fuel tanks.
"A" had its two oil radiators and one engine radiator plus a smaller radiator parallel with the engine, cooled by coupled fans driven by the motor. In "B" the cooling compartment decreases in size, there is an enlarged oil tank at the rear that is perpendicular, while the engine radiator slightly increases in size and has only one fan. What needs to be built is two mirrored "B" compartments with the afferent ducting.