I personally look at it as a very expensive lego set. I don't use PVC, but try to do it by interlocking, then using epoxy to secure once all in place.
I actually just redid mine last week, got bored, and I haven't reworked the rock for 2-3 years.
I can also help you, as long as you are in the SW area.
Rick
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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