This is what I'm planning to use for a stand. This should hold the weight and then some. I Salvaged a 10"x6"x1/2 thick extruded aluminum I-Beam drilled for function and because... I want it to look like a race car when it is done.

Cut to size, drilled, and polished all with hand power tools and sprained elbow grease.
(man that hurt when the hole saw bound up the first time) 

Looking forward to seeing the progress photos!
Long day.... I'll be back
OK! This Tank-in-wall project was done in conjunction with a powder room re-do.
(gotta keep the wife happy)
In this pic you see the doorway from the powder room to the fish tank room.
I framed in an end view that will be seen when you go wash up before dinner.
My buddy Carlos here is helping me with the project.

The I-beam is bolted to a post that is brought down to a footing we poured in the crawl space.
The other side of the I-beam is sitting on the foundation.
I joined it to another beam that is against the back wall.
Thus the entire floor of the fish room is free and clear of stands or supports.
I will tile the floor and put a drain in it in case of spills. 
I ran a few extra 120v circuits to the room also. Too much power is never a problem 
I'm putting an exhaust fan that will be controlled by a thermostat to keep the room at a constant temperature...



The 85g in the background is going out to pasture... Literally...Lots of hair algae
jar,
Wow, nice build. Let's see some hardware for the tank.
More pictures please
Looks like it will be fantastic! 
Reefstud
If I had more time and more money I would be snappin more pics of cool stuff that I don't have yet.
Besides, I enjoy sharing the custom build stuff as opposed to an off the shelf used skimmer.
Thanks for the compliment. A labor of love...
Getting started. This is a non structural wall.
(I think) 

<º))))>< ..... Have fun every day! ..... ><))))º>
----------- 215 gallon in wall Tank thread----------