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That looks like an interesting project! I've built a couple of bows using oak, but I've never tried PVC. What size pipe did you start with?
I used some thin wall 4 inch drain pipe and a heat gun to make a couple vertical plant growing towers a couple of years ago, that was an interesting process....

this was 1 1/4 inches. This weekend im going to be making a proper build video and do it with a piece of 1 inch schedule 40 pipe. you want the thicker stuff. the thin pvc is too thin to make a bow out of.