Would more German ships built to one design have gained economies of scale?

Would building more ships to a common German design have produced benefits of scale?

Yes, if the design remained stable. Repeated internal changes prevented superficially similar ships from delivering the full benefits of a common design.

A larger number of ships could have brought benefits if German designers had settled on one design and repeated it. The qualification concerns how much changed inside ships that looked similar from outside. Reworking each vessel reduced the commonality that made a larger class advantageous. The proposal concerns additional Scharnhorst- or Deutschland-type ships.