Long time SC member Steve Jensen is selling his custom made sheet metal sub carrying cases. Steve is a professional sheet metal artisan (tin bender) and does a fantastic job. Maybe you saw the two all metal Sea Hunds he made a few years ago at the SubRegatta?
To order a case, you send him a number of measurements and he makes the case to fit your submarine from galvanized sheet metal with a nice paint job. Cost - ~ $100 and up depending on the size of your model.
Contact Steve at email@example.com for more info.