Now comes the interesting part...
I've come to understand that setting a glass tank directly on a foam underlayment can cause more problems than it solves. I wanted the foam to form a solid, stable underlayment, but didn't want the trouble associated with setting the tank on it.
So what I did was put the foam BETWEEN the top of the stand and the stand's framework.
The top actually "floats" on the stand. It's not attached, so the foam can settle and compress without causing damage to the stand, nor causing potentially catastrophic torsion stress on the tank.
Next, I started on the faceframe for the cabinet.
Here is where the pictures drop off (one of the places). The face frame is designed in much the same way as the top. One thing to note is that there IS a center support in the middle of the front. I left it out during the original build of the frame as it was unnecessary to support the empty tank, and I wanted the clearance to easily get underneath when I was setting up plumbing.
The face frame is again solid red oak (no plywood), and is fastened to the frame using a very thick application of silicon caulk, to allow for movement between the framework and the frame, again to reduce stress as the stand settles into the rug.
There are two large openings the front, and a door on each side - one to allow the large sump to be slid in from the side, and another to allow access to the pump and skimmer without moving all the crap in front of it, and for a spot for the controller electronics (to be built... long story).