Beauty of a set-up, I like how the tank is 'showcased.' Having a currently cycling in-wal 75 w/o front access, I will try to help out. B/c I only have one viewable side, and can get to the others from the back w/ no issue, I would recommend front access in your set-up. It is a PIA the way I have things (looks good tho!!), and I think your's would be worse (for cleaning, 'scaping, etc.) When I saw Howard's old tank, I was impressed how he had front panels that were simply attached by using cabinet magnets. I think this might be the way to go w/ a thin laminate or paneling. This way, you could simply pull off the front panel, and go right to work.
Eduardo