Steve,
As for selection of a finish product, I would NEVER powdercoat a frame or any of the ferrous black parts that attach to the frame.
My experience with powdercoat is, it's d**n near impossible to remove once it's applied. It chips easily, even at the tiny "tink" of a combination wrench hitting against it. It is not resistant to any number of chemicals, including gasoline. The result of exposure to seemingly benign chemicals is staining, discoloration & dulling. Repeated exposure to the sun will turn it dull and eventually chalky. With the softest of polishing rags, including flannel, it develops immediately micro-fine scratches that mar the lusture powdercoat has coming out of the curing oven.
Choice of paint and and overall finish is a matter of choice and preference.
There is alot to be learned in copyng exact finishing techniques, as used by the manufacturers. The experience & expertise we develop & hopefully share is one reason for the Purpose of SOOC. And, whether our bikes are an unmolested orignal, an exacting restoration, a lovingly refurbished original or a tastefully administered over-restoration - each is a veritable feast to the eyes and all else that bike does to arouse our passion.
Won't it be exciting when we get our 1st chopper sandcast Member ?
Steve Swan