[Talonmotorsport]

I can't see why CP17 can not be made from ali other than it has a moving part behind it. As for CP16 it's probably easier to make in steel as it should be welded to join the angled section that goes around the steering shaft. If you make CP16 in ali I would put flanges on the angled part and either rivet it on or use some M4-5 bolts with nylocs.