I was thinking about doing something like this that would have 70% of it in common with this project in cutting a hole open in the side of a house. Where I would build a large cinder block tank outside on it's own footing system and then built the tank and a small roof over top of it. I would then add a few feet to the living room of the house by cutting open a hole into the house for people to look at the viewing window into the cinder block fish room from the house. I really hope this project turns out good in that it looks very good.