Got a little more done wit the vent windows. Here are a few pics of the process. This is about the size of the rivets that are steel.
I drilled all the rivets out, but left the pivot hinge rivet in place as suggested by some other forum members.
First thing I did after disassembly was replace the window stop rubber.
After cleaning up the frame, I had to slide the new rubber over the frame before installing new pop rivets.
In order to get the new rubber seal installed, I had to bend the ends of the window stop rubber up just a bit. This facilitates the new rubber seal which inserts over the edge of the window stop.
I then installed a few pop rivets from both sides to attach the window frame to the window slide rail. I hammered them flat and that made them tight.
Rivets before being flattened on inside of slide rail.
This is where the new window seal slides over the window stop rubber.
Before pushing the new rubber into the frame I riveted the window hinge back to the frame.
Holding the Frame while pounding the rivets was a bit tricky, but not too tough a job.