I purchased some 1/2" CPVC tubing to build the frame today. CPVC is much more rigid (and expensive) than standard PVC/PEX. Even at 1/2", the frame is very sturdy - I placed a board on top of the raised section and stood on it. Drilling the holes for the colinear rods was probably the biggest challenge. I think I did a fairly decent job of keeping them on a flat plane, but it was tough - even with the drill guide (below), particularly the 4 holes that had to go through the PVC Ts. A drill press probably would have made the job easier. Applying PVC cement to the joints and connecting all of them at perfect right angles took some care as well. This project is definitely a more complicated build than the standard SBGH described on the digitalhome.ca forums, which uses steel fencing as the reflector.
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