Cool, thanks, it does look sweet for sure! You've pioneered new territory for us. Next thing you know Tomba and Tomasa will both have LED big screen TV's bolted to their tanks! 
One or two of the guys over the years have modified their gas cap lock so the key can be removed. I don't recall who they were.
I hope the author of this won't mind me referring you. Its an excellent photo series of the gap cap assembly, or should I say dis-assembly. From this, it appears the bolts are threaded into the tank, not simply pinching the top ring to thebottom ring, and since they are anchored you are correct the seal between the fuel tank steel and the underside of the bottom ring should stay sealed.
http://www.flickr.com/photos/15071518@N07/sets/72157603817877190/show/
gillthadevildog:
I dont know why but for some reason the key will not come out of the gas cap after opening it. Also i have had no problems with any leaks but im not sure whether they hold anything or it they are just for looks. But about the seal not being held flat..........the seal is still being held flat because the bolts held the top ring down and the only difference from the way it was originally installed and the way I have it with the bracket is that the bolt is longer and holds more stuff on. It still holds the seal flat. If that makes any sense. Im not no mechanic or anything im just an 18yr old tryin to do stuff above his league so i may be wrong but its the way I see it from what I have learned from various things, what the best mechanic I know has told me, and what my dad has told me(my dad has been working on bikes all his life and now owns a dealership).