UL Inflatable Pad for a giant!

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I'm 6'6" with very wide shoulders (Think Rugby player). I love my ENO double wide but have struggled to find a bottom side solution that is wide enough that isn't too heavy. So here'e is my bright idea----

I'm gonna buy two Space blankets 56x84 6oz total
http://www.rei.com/product/407104/sp...rgency-blanket

I'm gonna bond them together with contact cement and duct tape and make a giant Mylar balloon. I'll leave a hole for a small rubber hose for inflation/deflation and add an oral inflation valve

http://www.ehow.com/how_6784663_make...c-balloon.html
http://www.ehow.com/how_5592989_bond-mylar.html
http://www.scubagoo.com/o-rings-regu...ion-valve.html

If it holds air and I think it will (cause Mylar balloons hold air forever!), I'll buy Silnylon and make a cover to go over my balloon. Add some shock cord and I've got a man sized inflatable UL underpad.

Weight-
Mylar 6 oz
Silnylon 5.5
Valve and little rubber hose 2 oz (guess)
Shock cord 1 oz guess
Glue and thread .5 oz guess

I reckon I'll be under a pound

Cost
Mylar 10
Silnylon 25
Valve 10
Shock cord 5
Glue 5

Maybe $60 bucks
WHAT DO YOU THINK?
I don't want to try it if it won't work....

[Bomber]

Absolutely possible, check out this link it's used in mountain marathons where small packsize and weight is vital for results. But it could be used as your idea(i like the mylar balloon idea).

Edit: i would make it with several chambers for maximum stability, also keep in mind that it probably wont be very warm.