Thanks bigbama - this seems like its definitely a viable option, and relatively inexpensive to DIY. maybe it could be my first DIY project using the guide at diygearsupply.com.
i guess i thought that it said here that it wasn't breathable: http://insultex.com/index2.html
I think i may have read it wrong though.
I suppose the lack of packability is a downside, but in my case a CCF pad was the other option and those don't exactly excel in that category either, so its probably a better option in that regard. I could even have a nice picnic quilt!
The only thing really tieing me to a CCF pad is the option to use it as a pack frame in my SMD traveler, although i suppose a 4oz stay and insultex pad may end up being less weight anyway and better support. Do you have any idea what yours ended up weighing? and did you follow the directions on diygearsupply.com? (any tips?)