Tank Mechanic Simulator
I'm having fun with this one as a tank nerd. You repair WW2 era tanks either as a contract for others in exchange for money or as abandoned tanks you found in the field that you can add to your own museum or sell. Piece by piece you de-rust, sand blast, prime and paint the tank as well as order replacement parts, and you can repair the engine and the turret at separate stations too. Sometimes too you'll have to use the welder to fix any holes in the tank.