Home Built Tractor

This is a walk around one of my home-built machines. Actual year built is unknown, it was a scrap yard find that became a gift to me from my wife her parents. Engine is a 1947 Wisconsin AHH Transmission is a top-loader 3 speed... originally from?? Front axle and steering box are possible from a Model A Rear axle is unknown... and needs parts! If you know what it is, let me know