There is one thing I have to add if making a tarp for something like a 15cwt: Make the tarp about 4" bigger than the original. I made a couple, and despite exacting measurements, the brand new canvas mysteriously shrunk once it was sewn together. It could be stretched, but as soon as you put it away for the winter, it would shrink again. So add a little extra.
I was fortunate that I was able to do my experimenting on the mat tech's machines while I was still in the service. Many a lunch hour was spent experimenting with various canvas and seams and stitching.
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