already built my pool. Now upgrading my koi pond , gunite build . Its big enough to be a small pool 14x18 freeform probably close to 10,000 gallons . The big difference will be the plumbing , mostly requires gravity plumbing line and huge 4"koi toilet bottom drain. thought you may be interested . Its my own design and plans upgrading from 3500 gallons . building with subcontractors