I came up with this idea for the lateral braces using a hole saw with a drill press to cut out the ends for a good fit. Saves money on fitting cost if you build more than one. This way I can adjust the braces and it makes for easy storage.
Each 1 1/2 thin-wall PVC pipe is 10 feet tall. I used three to make a triangle.
For about the same price I could have gone 1 1/4 sch 40 but I think the 1 1/2 thin wall was just a bit stiffer although either should work fine.
After the first frost I will wrap the PVC pipe with stretch plastic like these use to wrap shipping pallets.