Hello Bill, I was thinking a hump might firstly look the part on a cafe racer, secondly discourage any would-be pillion passenger but finally also be an occasional seat if really necessary. It's been fun just working out how to get it done and it took me a while to find some replacement edge clips, which are from Bresco in Loughborough (1.2 to 3.6 mm panel thickness size).
I inherited a Singer treadle sewing machine and it has coped with the 1- 1.5 mm soft leather with absolutely no trouble. By contrast, I struggled to get a needle through even one layer by hand.
If I get keen and find some time I'll add a trimming strip all round to hide the clips. There's enough hide left for that.
As usual, if I had to do the job again I might get a better result.
