4 x 4's...
. Your's doesn't count Steve...
O.K. Let me add another scenario or two to the eqauation. Let's assume you're not building a beautiful tank, built into the wall,(Steve), and you're not hangin' out in some "Frat-house" with an old wire spool for a coffee table which is covered in empties and magazines
. This tank is goin' in the lobby of some elaborate establishment so a nice wood finish is critical. At what point do ya' want a metal support structure encased in wood finish ?