Maybe a machining and fabricating forum would be a good idea. I am still learning for the most part. Just doing practice cutting on my mill. But on the lathe I've made spinner back plates, turned down flywheels on ryobi's, made prop hubs, and lengthened some struts for my spitfire. I will eventually make my own retracts. Dont know if I'll ever try to make any money at it. Then it might not be fun.
Edwin