Working in a business manufacturing canvas products has it's advantages -
I have been going to make a tonneau cover for over 12 months and a bikini top for maybe 6 months. Last week I finally got in and made a start.
The tonneau cover isn't a huge job. Maybe 4 hours from scratch if you have all the gear ready to go.
First I needed a couple of support bars and a way of mounting them. Usually we use a plastic "bar bracket" like this
They get riveted to the inside edge of the bed.
I didn't really want to use them because I don't think they suit the jeep and they hang into the bed a little bit.
Because the m715 has wide gunnel rails I chose to weld a piece of heavy wall tube about 1 1/4" long into the top rail like this
The plastic bar bracket would take a 3/8" rod but the tube I welded in needs a 1/2" rod to fit snug. The little bit heavier rod worked better anyway.