Thanks, Sum. If a rivet pattern is going to have any strength it has to be closely- spaced and that means a lot of holes! A few hardware store Pop rivets isn't going to do it.
I like those cylindrical Clecos. For installing or removing lots of them a hand tool gets tedious and is slow. I found an Ingersol- Rand air tool on eBay for doing that job and it really is slick.
Clecos are like garage space, closet space and hard drive capacity-- no matter what you originally thought, you never have enough.
Regards, Neil Tucson, AZ