Wasn't able to get any more work done on the stand as I spent a good part of the day adding more floor support in the crawl space where the tank will be. When we started building the house I had them double up the I joists in the room and then the builder filled in the webbing area with 3/4" plywood but I still wanted a little more piece of mind. So I added 3 hand blocks that were sitting on 20x20 patio blocks. I then laid a 10' 4x6 across the the hand blocks, secured another 10' 4x6 to the I joists and then added three posts using 4x4's. I knew the floor was secure before doing this but for the $100 in materials and a few hours of work I feel totally secure now.
As far as the stand goes....I was able to layout where all of the cross braces will go. From left to right they will go at the 16", 30", 42", 42", 30" and 16". As stated in my previous post, the top of the stand will have two sheets of 3/4" plywood that will be screwed and glued down to the stand. Im hoping to get the top and base finished tomorrow morning.