I used a wire and a paint marker to scribe the parting line where I will cut the tanks in half. I cant cut them here though without getting my ass evicted. The landlord has no sense of humor when it comes to grinders and sawzalls. I'm thinking I could make a rubber mold and take the patterns out of them in plaster till I move to the new shop. It would be nice to have at least some things ready to go before the move!