Got the first vent assembly done except for the pivot. Scratched the new paint a bit so a minor touch up in the morning and finished soon after lunch I hope. The second assembly is now dismantled and taking an acid bath. I am taking pics of this process to help the next lucky bolter.

I tried the pop rivets also using 1/8 dia x 1/4 long rivets. They had to go in from the front side which left a significant 'tail" in the window channel. After grinding this down the rivet lost any retaining force. I moved up to a 3/16 dia rivet and found that it would hold after grinding down the back side but the head did not set down in the stripping enough for my taste. It would work that way but it would rob me of the full experience.

One trick I found if you use the vise is that if your vise does not have enough throat on it you can cut down the rivet setting tool to get enough clearance. I also did a couple using the swinging press and the results were acceptable also. a short length of 3/8 thick plate works well as a backing drift also.

The vertical window channel will get anchored at the bottom by a pop rivet and use adhesive along the rest of the channel to keep it in place.

Thanks for the suggestions.