Pete,
I applaud your ambition, determination, etc. Many of us have dreamed of turning a room into a tank but never had the nerve to pull it off.
If I may offer one suggestion; in an earlier part of the thread I believe you may be underestimating the effect of the moisture this monster will contribute. I would encourage you to create a barrier between the tank and the structure above, perhaps at the "A" frame already created and painted white. Just my two cents.
Again congrats to you and all of your progress. This is truly awesome. I've killed a lot of time these last couple weeks reading this thread, but no I didn't go back to your older ones.
Smilies say it best. :bowing: