I scratch built M75 APC around 1996 with pictures and data from the library and the internet. Using the suspension of Tamiya M41. The hardest part of the build was all the angles on the roof and the commanders cupola.
My scratch built M44E1 APC was around the same time as the M75 APC. The hardest part of the build all the angles on the roof and two cupolas in the front plus the curved front to the belly, transmission area. The M44E1 Final version had new motor, new transmission and the side doors where removed and hatches put on the roof and new rubber chevron tracks.