Nah, I'd just put it together, ride it, get it set up the way you like it. Next time you tear it down, or put new plastic on it, you could polish it up.
My goal would be, if I were you, to get it going first, then worry about the cosmetic stuff.
I know it's super tempting when it's sitting there in front of you and waiting for parts, so if you have the spare time to buff it out don't let my opinion stop you. Just do the swing arm too, cause it always looks wonky when the frame is done and the swing arm is still brushed.