Other than bow deck, where else could we fit a water tank? Want to keep bow deck flat(no step up) due to headroom for husband required. Have hired one like this, presume they had theres somewhere else, but wondering if it would have been small tank, as we were advised to fill up everyday and perhaps for the ballast. We want to live aboard so would need min 100 gallon/500 litres. We are designing hull ourselves- so does give us more options if they are available. Any ideas would be helpful, we would also need room for pump out toilet if poss. Dont fancy the cassettes, but know we May have to compromis. Boat length 62ft.