I have doubts whether breaking up the capital ships would be such a good idea. In contrast to what many believe the real bottlenecks in Germany's war-making potential were not the raw materials (excepting oil) but manufacturing capacity. If you scrap a functioning battleship for the raw material, you need a lot of manpower for the scrapping, and, more important you use energy to turn something valuable - a working (albeit obsolescent) weapon - into something far less valuable, raw materials. I cannot remember any of the World War II powers scrapping a battleship during the war, and if they did, it was certainly not one that was as new as the Tirpitz.It is quite significant that the move was opposed by Doenitz, who was far from a battleship fan.
On the other hand it would probably have been an advantage for Germany's war-making capability if the Bismarck and Tirpitz had not been built in the first place. But that is something completely different from scrapping them after they have been built. If I buy myself a Rolls Royce I spent a lot of money that could have been spent better elsewhere. That does not mean that I get such an awful lot of money if I scrap the Rolls Royce and sell the raw materials.