[jacquesm]

Hah, you'd think so. But the skills required to make some gears are off the charts and CNC machinery doesn't fare all that much better because you first need to figure out what to make exactly. This requires a functional part, or at least one that will allow you do determine the key dimensions.

Bodywork and such is relatively easy, suspension and exhaust parts are doable. But engine parts and drivetrain components can be serious challenges.