I can hook you up with a few extras I may have for pretty cheap. I should have most of the stock electrics, reuglator, solenoid, I'll double check if I have a rectifier or not. I have an ignition switch with a key too. I will check how good/bad the gaitors are that came with mine, may have the throttle grip tube for you as well. PM me if interested.
Front brake pads, look for a Daido set on ebay, generally cheap.
For banjo copper crush washers, Uncle Terrence recommend Harley Davidson's, because they have an o-ring fused in them and work a lot better. I don't know the part number, I'll be buying these for my own build as well as soon as I find the correct part number.