Wow very nice. So close to where I am too. Is it just me or does it seem like most of the monster tanks are in Canada. 
Miles;2122459; said:ever think about spraying it with an epoxy liner type deal? I have heard alot of people doing a 'final seal' on ponds like this with the same type of marine epoxy they use to seal fiberglass boats.. sorry if it was already talked about.
Nice Build.. I want to do something similar but more like 16x8x4'