Did a dry run with clamps and got all the wrinkles out.
Think I’ll try it I make a 1/2x1/2 piece of wood instead of the angle. Haven’t found syringes with gauges of needle the will work yet.
If I can get the fabric like this with the re-polytak, I think it will be alright.
Lesson learned. Bolt your seat in before you let people sit in it!