Hi Mark,
I think you will have to spend a few more 10p's.
I researched my Dusseldorf build continuously for 18 months, and haven't come across any freely available plan cross sections.
All I can suggest is that if you are in the Crewe area, drop in for a coffee and measure the hull on mine, before I sell it.
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. I can supply you with a lot of detail pictures if you want them.
John