How do you build an indoor grow tent with a PVC pipe frame?

I agree with Rusty Nail. People all over make greenhouses and grow tents with PVC. 1/2" fittings come in all sorts of sizes and you can get some that are particularly useful from www.formufit.com. You could also upgrade to 3/4" or 1" PVC to get more stability. 1/2" is sort of flimsy.