You can throw the small round wood wheels that you get from using the bow saw on a straight branch, into a fire, but you cannot throw wooden disks that you get from using a bow saw on a butt log.
Same goes for the stacking, cannot re-stack the disks, but can re-stack the wheels.
Making a car base is fairly easy, compared to the engine. The car base cannot be moved without the engine, which makes it frustrating when someone builds the car base right in front of the forge, but doesn’t even start the engine.
You should be able to push the car base or something, even if it was as annoying as carrying a giant rock, I would be pleased if I could move it.