Sean - I think that your idea sounds GREAT. I would personally go for 2 BIG coral "mounds" in that awesome size tank of yours. Where the 2 mounds are joined by a "bridge" of some sorts, which you can place corals on - and under (ie sun-corals love being upside down, under ledges, in the sea - I have personally seen a HUGE amount of sun-corals growing upside down, on Protea Reef on the South Coast of KZN)....
I hope you understand what I mean?
The 2 "coral bommies/mounds" can then have multiple levels of "swim-throughs" and hiding places for the fish.
On these 2 mounds, you can create "stairs", on which you can place your corals....
Perhaps build in "plastic" coral-tie downs - which you can use to glue, tie-down, or pratley putty, corals. You could possibly use egg-crate in-between the live rock/fake rock, to achieve this?
I hope you understand what I am trying to tell you?
I will try and find the pics of a similar tank, and post them pics here.