You posted this the day after I gave up and elected to just buy some metal shelving to use as a stand for my display fuge, and it's already shipped
To be fair, even using spare 2x4 and 4x4 I have, I figured the rest of the materials (plywood, etc) was going to run me $150 or so, whereas the shelving was $75 and will be delivered this week - as opposed to the *-only knows how long it would have taken my... let's be kind and say deliberate, self to do. Especially since my shop building currently doesn't have power (that's a whole other batch of money to spend, ugh).
Still, it's meant to be somewhat temporary, just so I'm not waiting forever on this just to get my tank running - PM coming your way.