ReefMagic, just checking your build out and it looks like an impressive well-built Tank that would be a centerpiece in any home. In my opinion, getting the biggest tank possible within budget is the way to go as they are much more forgiving. One thing you should consider is access. Your tank is very deep/wide and reaching the bottom with lights above is going to be difficult. You might want some sort of pully system to raise them. On a final note, I like the double wall idea, cleaning the glass might be a challenge, and I assume since you're in construction cutting those triple studs was not a problem.
