Thank you for this post. I too would like to do the same between the bedroom and den with a closet on both sides. I like the support frame Not bulky but it looks like you are pushing about 600lb of support per square inch on the frame . I light weight thick rubber foam under the stand on under the tank for settling, I was so afraid of a stress crack. I was thinking of a air duct over the tank as well did you do anything in that area ..
On one of my free standing tand and conopy I wanted a little more re-enforcement, I used met brackets as well. I really wish I had painted them, the oxidation is bad now, so I figured I needed to coat them, well been really busy so no time to take it all apart, I used a hot glue gun and took the pain and whipped it over the brackets, a few burt fingers later I sowed the decay down. anyway I noticed the brackets and the reminder of buring fingers came to mind.
More pics, more pics, more pics

I need you to do all the hard parts and post them so I don't have to!hehehe