Well first of all trust me, there is no room in the stand. The sump fits very snugly in the stand and I'm running a filter sock, a protein skimmer rated for 90 gallons, a bio pellet reactor and a phosban reactor, the return pump and a heater. The tank is full of SPS. I have one Ricordia as well as a colony of Bam Bams, but other than that it is full of SPS and I have been dosing a lot and I'm extremely sick of it. It is ending up costing a lot of money and I think once I am over the initial cost of the equipment, the Calcium reactor will be a lot less expensive to run and my system will be a lot more stable. I am also going to be keeping a Cuttle fish in the tank soon and I think the additional water volume will be extremely beneficial. I will also be able to house feeder shrimp in the sump
I would post a picture of my stand so you could see how packed with equipment it is, but I am on my phone right now because I just moved into a new house and the internet is not going to be hooked up until tomorrow. If you want to see it though, I have pictures of it on the build thread in the member's tanks that I posted in the spring.
Also, there is a crawl space right next to my room that has an access door so it is easily accessible and it has an area right next to where the tank is going to be that drops down all the way to the basement so it will be very easy to run the plumbing