A couple of things. first I used a wrap made from an old t-shirt cut into a long strip instead of a bed sheet. It seemed to stick a little, and the glue soaked into the knit instead of weeping through like the buildalong shows. I also didn't have enough inner tube to do that step right. I think it will be fine, it just isn't as pretty as yours. It looks more primitive, maybe. The reflex seems to be holding, so I am optimistic. I have since acquired an old bed sheet (wife wouldn't let me use hers for some reason) so the next time may be better.
Does sinew allow a bow to bend further than a self bow would?, or does it just reinforce a weak back?