Sounds cool!
What are your plans for the tank? Will it be BB? Sand? Do you plan on adding Plants or Driftwood?
I had a 180 reef with a 50G sump and the best thing I ever did was put a door on the right side so I could slide the sump in and out of the stand incase I ever needed to. It was rare when I used it, but I did need it a couple times and I was so grateful I didn't have to take the tank down to get the sump out.
Whiskey