I spend a lot of my summer up in alaska teaching expedition stuff for NOLS. So, I end up sleeping on snow in a big tent. For that, I have a different version of the pad system that I describe in the article above.
I use a longer inflatable pad (a Therm-a-Rest 3/4 length ProLite 3) and glue enough yellow EVAZOTE to match my height. THen I added a short rectangle of nylon fabric to the head area, and this acts as a "stuff sack" (sort of) when it's all rolled up. No ground cloth. It comes in at 17.5 ounces.
Dale suggests using VELCRO as a way to secure the pads together. I have played with this in various configurations. It works pretty good. The one thing that should be noted is that sticky-back velcro doesn't make a good "seal" on some of the slick pad surfaces. It gets ripped off really easily. I've played with glues, stinky cements and various sizes of velcro. Alas, I haven't found the perfect solution - YET!
It's a good idea, but it will take some R&D to perfect.
peace from idaho...