Also... I must add that I removed all the rivets on the outside with the Air Hammer and Chisel from before (when I did my interior panels). It did a good job of removing them without too much hassle and left everything in good shape still. I would recommend some practice removing interior rivets on the panels before moving to the exterior. I let me friend try a few and he definitely did a number to the sheet metal. I had him remove rivets on the panels that were on the support beams, so it didn't matter if he damaged the sheet metal
Also, I purchased the Harbor Freight Air Hydraulic Rivet Gun to put them in. $32 with a 20% off coupon. Worked like a dream! I'll never hand rivet again if I don't have too.
Also, thanks to Lapeer20m's tip, I had a air hose hooked up to the bus's air tanks. Since we are working in a field and I don't have a big air compressor, I ran all the tools off the bus engine (running on WVO). Worked great! Even the air hammer ran well of the bus's tanks. Sure beat driving 45 minutes to my friends dad's house to use his stationary compressor. Ran all of our electricity from the shed.
And... last but not least. I was very nervous going into this project. It was a project where there was no turning back once I started and I had no experience with anything like it. With two of us, it was a piece of cake. I highly recommend window skinning now. It did so much for the bus and really wasn't hard at all! Our insulated subfloors were much more work