Been there and done that
Originally Posted by Vaughn McMillan
Like Jeff and others are saying, if you build it out of 1/2" plywood and have a solid top, bottom sides and back, with something like a face frame on the front, just to make the doors easier to hang, and to cover the edges of the plywood, you will be plenty strong. If you are REALLY concerned, (after all, 29 gallons of water would make a mess) then put a center panel in side the is basically a third side, but in the middle, that way you could put shelves on one side and a large open space on the other.
I think you will get the best support for the unit if you build it so the sides of the tank sit almost directly above the sides of the cabinet, but it can also be a bit wider and you can put an edging on it to cover up the bottom corner of the tank.
Good luck, take pics, we will be waiting to see what you come up with.
The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.
William Arthur Ward