For the record, I'm totally against an all metal ski. However, you may have a market if you made a bolt on mold of the bottom. Line it in rubber or foam so it doesn't destroy the bottom of your stock hull and just cover the bottom portion and sides while omitting the pump tunnel. Could possibly even incorporate the ride plate if you want to get fancy. You could bolt it to the bond rails all the way around and wouldn't even have to worry about the hull leaking when you remove it. Think removable river armor... It would probably add 30-40 lbs just for something basic like that made of 0.080"-0.100" aluminum. At least then, you could add it as insurance when you're riding stupid stuff and then remove it and have a lighter hull all the other times.