Wow what a magnificent project Rodger ! I can't believe I haven't kept up with this Thread
Keep a close eye on the temp when you add the Halides they'll probably lead to a considerable increase in the temperature. The back of the stand appears to be completely closed that could be one of the reasons for the high temp.
Looking at the aquascaping Rodger this is just my opinion but you could do a couple of Islands of Rock and leave some open spaces for your fish and it also allow better water circulation which is very important to keeping a reef healthy JMO.