Thanks for the support guys.  MP - no material was left over.  I started with a rectangle of material and used the 1 yd. by +/-54 inch wide fabric, taped the two long edges together, then sealed one end to form a bag and put the nozzle piece into one of the bag corners.  No cutting needed, unless you would want to 'square up' the edges first, but I didn't find that necessary.  Still mean to get some pics posted, but lots of other stuff going on too.

Jon - as far as aerobics goes, good  point, but keeping the moisture out of the pad, especially in cold weather makes better sense to me in preserving the longevity of the pad. 

If any of you take on the project, or have improvements, I'd like to hear about it.

pd