There are three kinds of rivets:
1) Solid, or "bucked" rivets
2) blind or "pop" rivets
3) Olympic rivets (which are essentially a fancy pop rivet that is used on the exterior, and always has to be shaved)
You can install blind rivets, Olympic or normal, with the same rivet "gun." Solid rivets require a completely different gun, that looks like a typical air-hammer, and a bucking bar. To install bucked rivets, you have to have access to both sides of the Airstream's skin, as you will have a person on the outside with the rivet gun, and a person on the inside holding the bucking bar against the back of the rivet. Olympic rivets are installed on the exterior on occasions when you need to the rivet to look like a bucked rivet, but don't have access to the interior. Olympic rivets are not as strong as a bucked rivet, and they tend to be leaky as well. They have to be shaved in order to look bucked. Shavers are expensive, but one of the suppliers (Air parts inc, or Aircraft spruce, or VTS), will "rent" them out as well.
I'm not sure about your question about removing windows, and why. Anyway, if you want to remove the entire window frame, and then reinstall it, you could use Olympic rivets to make the job look as though the window is bucked in--but the rivets have to be shaved. I'm not understanding why you would want to remove the frame, though.
Flat aluminum sheets on an Airstream are referred to as "panels" and the curved ones at the front and back are referred to as "segments." On a 70's Airstream, all of the curved segments in the front and back are formed, and have a 3 dimensional curve to them. If you want to replace an entire segment, you have to buy a new or used segment from a dealer or used parts supplier--you can't just get a flat sheet and try to bend it to fit. If you are dealing with a hole--you can just put a patch on it and rivet the patch on with Olympic rivets. Replacing an entire segment is a big project, and is best done by bucking it back into place. I wold recommend a patch over replacing the entire segment, if you can get away with it.