Well, I was tank shopping and decided to go with a 24x12 platform for 20 gal
tanks. I got the measurements of the tanks, and I am just short of being able to go three tanks vertically because of some cabinets where I am going to put it. I guess the top tank would have been a bit difficult to service anyway.
Now I am not so sure it is worth building the stand, since a two tank metal stand is readily available for about forty dollars. I figure the lumber cost, plus the time and aggravation cost might make the metal stand option better.
But I am curious, for the horzontal 2x4's, did you do anything special to make them flat and level to rest the tank rim on? Or were they straight enough to just put the plywood or the tank on them without modification? I do have a miter box to make the ends of the upright 2x4's straight, but thought the whole length of the horizontal studs would need ripping on one side to make it level for the tank rim.