Beautiful Reg! All the details sure paid off. The handles, the windshield, the wipers, and paint all turned out really nice. You have to be happy with the results! The 850 looks great driving around in your videos. It's very sharp.
Did I read right, that your differentials have already let go? You might want to give these E-Savage differential kits a try. Made by a Canadian shop as well, so shipping shouldn't kill you.
http://gcmracing.ca/viewitem.php?productid=44
For your cab clearance lights, I would just run 3mm orange LEDs inside them, with the appropriate dropping resistors, which depends on your battery source. It's pretty easy to figure out. It's hard to tell, but are your headlights already functional too? In some of the photos it looks like you have white LEDs inside them, or else it's just the aluminum reflecting the natural light. You could probably try warm white LEDs there too.