Just a thought if you haven't already started: instead of doing POR15 on the differential like you did previously and I followed along with, why not just clear the whole thing since it's all new? Just thinking out loud, but if mine would have come that way, clear is exactly what I'd do to keep the new, pristine look that no one else will have.
Also, any chance I can pay you to ship those blue axle plugs out my way when you're done with them and have the rear suspension built? Mine will be a long time in the making and it came filled with fluid so I get the lovely smell of gear oil and friction modifier in my garage