I read a bunch of info on them from the internet and here and just made one. I will look for it, but i am having tank issues now and have to go to work, it was in Pond section, you might be able to search here on AA before I can get home very late tonight.
Obviously you can have a huge amount of water, even though it is a 3 gallon holding space and depending on your location, you can hide it under a deck behind some bushes or lattice box.
I used JB Weld Marine, you can google it. You would patch it from the back or non visible side, fish were fine.