dude, I can't believe you put that greasy kit on your carpet... If I did that, momma would KILL me...
Can I talk your out of doing a screw build? basic tools are all that's needed to knock a barrel out.
IF you do drill the rivets out, look at the trunion from the front, and you can see how deep to drill. don't drill into the barrle.
I suppose a bent shell is one way to go... I perfer a flat, cut it with a dremel, leaving a very small amount intact, and fold it up. I saw some laser cut flats on auctionarm.com or gunbroker.com a few days ago, cheap.. like $30
And all the holes are drilled int he correct place.
There is some fitting that needs to be done either way. I folded mine up, after cutting it, and used the trunions as a guide. Then welded up the seams, carefully. It doesn't look as nice, but I am sure it is stronger than a bent flat, or a bent shell.
I guess witha bent shell, the only major thing you could mess up, would be placing the trigger guard int he wrong place. but that's a big one.