Melting PVC Pipe?

I am going over design plans and trying to come up with a way to build a 9' tall cylindar that would house 2 32" 400 watt HPS cool-tubes that are 6" in diameter. I a schematic laid out but my problem is my limited access to tools. So the question is, if I built a 800watt system whether or not I should try and use metal or rather be able to SAFELY do it with PVC?

if you are ventilating your cool tubes, they will be cool to the touch. how ever if your fans go out, your fixtures could warm up to pvc bending temps...

I gotcha, I'll go to the hardware store and see what all they have. Thanks bud.