Glad to hear that you and your family made it down there ok. Are you planning on having a canopy and built-in bookshelves that would restrict access from the sides? After working with your old tank for a few weeks I couldn't imagine only having access from the front without having to do some swimming.
Going with a little less depth would give you a little more wiggle room on the stand height in addition to being able to reach the back. Just a thought.