Hi Dave, and welcome to TR.
Beautiful job on the stand and canopy, they look great!
It sounds like you've done a good bit of research so far and are in the right track equipment and setup wise.
If I might give my $.02 on your stocking list, I think there are a couple of items you should reconsider.
Your coral stocking list looks fine with the possible exception of the chili coral. They are non-pohoto synthetic, require feeding with
phytoplankton and have specific care requirements. they are considered fairly difficult to keep.
As far as livestock, I think you're planing to overstock your tank. As you know the hippo is definitely not a good choice for this tank.
IMO, no tang is a good choice for a tank this size, including the yellow and Kole. The mandarin may not do well either. They are copopod eaters and require a lot of
LR to keep enough pods in the system in keep them from starving. The general rule of thumb is 75 pounds. People have been successful with less, but those successes are few and far between. Most mandarins end up starving unfortunately. The tank also needs to be very mature before one is added. 6 months at a minimum, and I'd prefer a year. The red scooter blenny and sixline would directly compete for food with the mandarin as well. I'd pick either the blenny or the wrasse and forget the mandarin. So, that leaves us with the pair of clowns, a lawnmower blenny, a spoted hawk and a six-line. That is a much more appropriate stocking level
IMO, and fish that will do well in a tank your size. Again these are just MY OPINION, so take my suggestions for what they're worth.
Anyway, welcome again, and feel free to hit us up with whatever questions you have.