Alright. I did all the measurements for support and crossbrace placement tonight (except on one bottom 4x4 piece since we have to cut it again). Getting the other 4x4 piece on tuesday and cutting it, and hopefully the plywood. Once all pieces are cut and ready, we will begin sanding and staining everything in all but connect spots which I have marked off.
That is Tuesday's plan. Not sure if we will get around to staining but hopefully we will. Next step will be putting together the bottom frame and all the walls.
After measuring, I have found that the planned 75 gallon tank can slide through the opening of the side, but will have to maneuver everything into place together in order to get things to fit ... 7 foot 1 inch room and a 7 foot tank and all.
And then I will be setting up temporary kiddie pool for a majority of my fish as I get the 125 out of the house, set up the sump, and await the arrival of the new tank.