OK let's see... The HNLMS Rotterdam was only completed to 40% when she was blown up. If the Germans would have rebuilt the hull (which I doubt will be unlikely because the reason why it was BLOWN UP, was to make sure the Germand wouldn't rebuilt it
) they probably would have finished it with a lot more German looks. For instance the final layout was installed in 1941 in Great Brittain, the original design featured the same armament as the De Ruyter class cruisers etc. The 6'' guns where installed in 1941 in Great Britain.
Nice to see you used my ship for your AU, but if the Germans would have captured it, it would have not looked like this. When I finish my current design (you can find it in my thread), I will also make the original design, so you better do your version from that one. Another remark, my ship was designed for the Dutch East Indies, so Germany wouldn't have to built a counterpart to it, because if the ships would have been built according to plan, the changes would be very slim that they would ever meet each other.
Sorry for ruing up your AU story, but that is the possibility when you redesign a ship that is still a WIP