Hey thanks hydrolife. I'm using 4" triple wall sewage pipe. It's really similar to schedule 35 PVC except it has a black rubber liner on the inside which conveniently blocks out light. PVC will work too, you just need to cover it. I would use reflective material from your hydro shop or if that's not available, use reflective tape. I'm using 3" net cups for each site filled with hydroton. To make the nutrient changing process easier, I lifted my reservoir a few inches off the ground and put a drain at the bottom of the front of the reservoir with a valve attached. Then I just drain the nutrients out through a hose about once a week. If you can put the drain on the very bottom of the reservoir, it would drain even better.
For the veg table, you can see in first pic a smaller tube coming up out of the nutrients. This is attached to an 800gph pump which goes to the other side, through a manifold which distributes it to all four tubes, and then it floods back to the reservoir. You can see the black, flexible 1/2" tubing that goes into the closest tube in the second picture. It works the same way the flowering structure does, by recirculating oxygenated nutrient solution constantly over the roots. Hope that helps!
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