Used 12k gallon fiberglass water tanks, in great shape, has 2ft man hole, the tank is 8ft wide by 36ft long. have additional sizes available ranging from 5k to 20k. can deliver for additional cost. i do not install!!! Prefect for cabins or where you need to store water. would also make a great underground bunker for storage or emergency shelter as fiberglass does not rot. could look something similar to the pics.