Well, the cost savings for the first one are not much of a consideration when the time spent and the mental energy are figured into the calculation. The real benefit will come on the second one, where there is a lot more understanding of the variables.

This tube cost $9 and I made a few boo-boos when cutting the first bands, but there is plenty of material left over for soft mount #2!!

I think I attached it before, but the PDF is an actual scan of the drill guide for the aircraft ply (1/8" 5-ply) that I used for my mount, and the stand-off bolt locations came out accurately when using it for figuring out the stand-off locations. If you want to use it, print with page scaling OFF of course!