Great idea,
now get it done, so we can see some pictures of it on the bike.

I've always liked an aligator or crock seat, but the more I see the Sting Ray the more I like it too.

 

I'd seriously consider using some stainless steel rod instead of coat hanger to weave thru the lacing. Many moons ago I made a similar piece to cover the top of the frame & oil tank on my Shovel when I ran a pogo solo seat. Tried the coat hanger and it did what they do - rusted. Redid it with some stainless rod used in TIG welding and that solved the problem.

 

should look really nice, can't wait to see the finished product. your buddy has some talent.