Well that is my intention, I really don't want to pay retail for the Cuben, so I'm trying to get it from the manufacturer, as I had read that Bill was able to accquire it at a minimum of 9 yards much cheaper than from other sources. I would like to experiment in several ways, possibly with the polyurethane film as an inner core and the cuben as a protecting outer layer, or if possible a double layer cuben air mat (for durability). It will be interesting to see.
Steve you mentioned bonding cuben, what is the best method you have come across and is this an airtight seal in case heatsealing it is out of the question (which appears as if it may be)
I contacted Big Agnes to find out the thickness of the polyurethane they use, the 2 mil Stretchlon 800 that I have found I calculated at 1.7 ounces per square yard, so it's much heavier than cuben and would probably weigh in at about 5 ounces, add a cuben cover and we're looking at 7 or 8 oz (including the valve) for a full size air mat... 20 x 70. Of course if I could make an air mat entirely out of cuben we could be looking at less than 4 or 5 ozs even with a protecting outer layer.
I think this will be a neat project, and it will mean I have lots of cuben for other projects as well.