I fully agree with Dennis' setup...I have used this for many years on the Tornado...never had any tramp material wear issues at the strap attachment points. When ever I see the straps stiched into a tramp I shudder. What a hassle to change them should they ever need it and if stitched at both ends, no tension adjustment is possible.

One other tip...don't pay a sailmaker for the strap material...go to a local "Pick-A-Part" type junk yard and cut out a few lengths of seatbelt material. You'll pay about $5 for the lot! I've used a hand awl (typically used for leather stitching and available in may fabric shops/marine suppliers) to add reinforcing to the ends of the straps by doubling up the belt material and stitching a large X pattern through the doubled section. You can leave a loop at the ends for the attachment line or, put a hole in the doubled section with a hot knife and add a grommet (make sure it's a real brass grommet, not the cheapo plated ones found everwhere).
Mike.