The seat back is done, although I plan to go back at some point and work out some of the wrinkles. It turned out fairly well.
The zip ties worked really well, I heated up the leather then worked my way up and down each side rolling the leather toward the interior of the seat and tightening up the zip ties. There is a bit of bunching at the widest part of the bolsters, but I got most of it out.
I am now back to the cushion... still haven't been able to get the bead on the bottom. I am waiting for someone to explain how it can be done easily...
