Lumatic, I got a hand-operated rivet puller (I believe it's "Arrow" brand) at a discount farm supply store. There were various brands and prices, but mine was about $40 as it had a swivel head. It's a great tool to have, but there are so many rivet sizes & types that you really need to know the job you have to do (ie: Airstream stuff!) before you buy a box of rivets.
Jim, thanks for the comments. The rivets on the brace ends are factory, but the rivets on the stand-offs are ones that I bought from Vintage Trailer Supply. They're the ones for the underbelly sheets.
I was hoping to get a lightly tinted polycarbonate like yours, but the dealer said he has a four-sheet minimum on his orders, so I was stuck with clear. Oh well. Looks much better than the peeling window tint and broken guard that was on there before--the neighbors agree!