Fishroom Multi Tank Stand Construction?

I looked at the fishroom site and it was more permanent than what I want. I'm not looking to build framing into the walls nor connected to them, so I'm going to have to come up with something on my own via trial and error. I think I have an idea that will work and hopefully this weekend I'll have time to put together one for two 55s. It will feature screwed together tank bases out of 2x4s with those bolted to support 2x4s or 2x6s.

I'm also not looking for something decorative. It's going to be purely functional and kind of funky. Although, I may paint all the boards black to at least make it look like it was intentional. All of the upright supports will be bolted together with lock nuts and washers.
 
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