I have cross-section drawings (very small, though they can be blown up) of the "O-19" and "O-21" classes.......... but no 3D modelling skills at all. The RNethN historical section has drawings of a few subs which can be ordered from them- from memory, "O-16" and the "O-21" class, but would have to check to confirm this. No drawings of the "K-XIV" class though.
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