By the way - after Mackensen seems to be claimed - does anyone have the Thüringen-class, the Ersatz-Yorck-class and the L-20-Alpha-class on their worklist?
The Ersatz-Yorck-class was done by Ashley in his KM46 AU, but never officially uploaded. While most of his later conversions are of course pure speculation and AU, his 'as-built version' would be close to the 'real' design can be found
here. Maybe you can use that as a basis.
As for the L20 Alpha, there was a request for sources
here, but as far as I now, nothing has come out of it.
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My worklist
Any help and source material is always welcome.