Very nice work, and not to rain on your parade but are you sure you want to powder coat the frame? If it's to be a driver there are some big negatives with powder coating, in my book, especially in cold climate states and it looks like you're in Connecticut? One of the big ones is if you ever have to make a modification by welding after the coating is done you're pretty much screwed - powder doesn't "patch", and paint doesn't stick that well to powder so to make it look right again means stripping and re-coating. As much work as you've put into it I'd opt for a solid epoxy prime and single stage paint every time, but that's just me.