The tooling like that is still being made today, and was in use for yrs and yrs, after the only Planet patents ran out. Very common to see this as a lot of companies just purchase tooling from Planet, instead of having to reinvent the wheel to make dies and build their own.
You tractor looks like a 12bb model or very similar model. The cult unit is one of the last types built for the walkers, with the levers to raise or lower the depth. The hood is basically only a half round piece of tin, with a small lip bent along the bottom egde, the rear has to bolts that go thru the ones on the tank, the front has screws that attached it to the grill part. Looks like your going to have to find some better rims, as most of the Bolens tractors had loaded tires, and it ate out the rims.
Hood is easy to make