I just talked to Dave, and they are starting to build the tank today.
I was hoping for a 2" eurobrace, but it has to be 3" wide to put through the polisher. Should be fine. Also, the back chamber needs to be 4" wide to accommodate the bulkheads so they aren't drilled too close to the edge. Sadly, my tank will no longer be a 69, it will be a 64. So sad.