Thanks, I appreciate it and am not dissuaded by those guys :). Talking with Andy at Rebreatherlab, he says a lot of his customers just strap them to the backs of the doubles, so I'm not worried about what the mainstream guys are saying. Bottom line, if you way back or deep and you need to bailout (or let your buddy bail out on your gas), then you need to have the gas available. And I don't really see the difference between slinging tanks and having them on your back, except that it's more of a pain to sling them sidemount because you also have to have the deco bottles and both pockets semi-blocked. You should take a look at www.whitearrow.eu. They have brackets (steel or aluminum) and manifolds to do this already that you can just buy off the shelf. Nick is also very responsive if you send them an email. UTD has some brackets too on their website, though they look clumsier. Love to see some pics when you have them. Mike