First I am grateful for your build thread on this new tank supplier. Watching with interest.
Sorry I am a bit late chiming in on your aquascape. I like what you are doing --particularly with spacing -- but will share one element you may wish to consider. Height of the stack(s). In my last build, I went too high and I am regretting it. Why am I regretting?
a) Blocks flow especially once corals start growing out
b) Visually, my prized acros are at the top and you have to bend over to see them. (Less of a problem if stand is real tall or you view from a seated position)
c) After 18 months, the acros and caps are growing out of the water (quite unsuccessfully)
At MACNA this year, one of the workshops was on aquascaping. Joseph Caparatta of Manhattan Aquarium was the presenter; I'd seen his stuff before it is awesome. He floored me with this statement: "The maximum height of your tallest stack should be no more than 1/2 the aquarium height." I asked for clarification and he listed my ABCs above plus a few more I forget. I built to about 2/3rds the height. Doh!