Here in Sweden the building of home made tractors was also big in the years around the WW2.
I am a big collector of these old tractor myself.
Here are some pictures of some of mine
Made from a 1949 Bradford, with an extra gearbox from a Ford Prefect.
Made from a 1949 Ford Popular, with an extra gearbox from a 1940's Chevrolet and a Ford 2-ton truck rear axle.
Made from a 1935/36 Chevrolet truck.
Made from a 1941 Chevrolet truck, with an unknown truck rear axle.
Made from a 1947 Chevrolet truck, with an extra gearbox and rear axle from a Ford truck.
Made from a 1950 Volvo PV 445 delivery, with an extra gearbox and rear axle from a 1940's Chevrolet. Pic from how I found it.
Made from a 1946 Dodge tow truck, still need some work.
My latest find, a home made tractor made from a former Volvo PV834 Ambulance.
Made from a 1930/31 Ford model AA, with an unknown truck rear axle. Pic from where I found it.
Made from a 1939 Plymouth, with an extra gearbox and rear axle from a 1940's Chevrolet truck.
Made from a 1932 Volvo LV72 truck.
And finally so far one made from a Volvo LV66 bus.
But there is a lot of work before they all can roll by their own power.