I don't want to discourage you in any way because I think the truck is cool, but I'm not nuts about the patch panel: Vertical welds on a frame are a bad idea. If it is going to be used occasionally and lightly then there might be no problem. But if, like me, you think a truck is for work, you might be inclined (again, like me) to brutally overload the poor girl from time to time. In that case you'd better keep a close eye on that stretch for stress cracks around the ends of that panel. It's not that big a deal, really, to do it over with a parallelogram shape to the patch panel, and 45* diagonal welds on the frame rails. Maybe not necessary, as I said, but something to watch.
As to your diff, it looks like my old one, which would make truckernix right. My improved ratio is 4.10, from a '72. Spendy, but worth it!
Finally, Huck brakes are bigger, therefore they run cooler, which is better.
