If i could make a sugestion… Using PVC will be a nightmare… It seems like a good idea at first but after seeing the autopower cage, there are a TON of subtle bends in it. It wraps around everything in the car so beautifully. I am REALLY impressed that it fits so nicely into something that could have so many stacked tolerances. If i were you, i would buy the autopower cage and add the front two points and doorbars… Really. You will save yourself a TON of time. I know you like DIY. So do i. I was planning on making my own cage. I can tell you that buying it was a much better decision.