Re U-Boot interiors: the very first U-Boot, U-1, is preserved at the Deutsches Museum in Munich. Sections of the hull have been cut away so the interior can be viewed and I have a photo in a book somewhere taken at the museum which I could scan (once I find it that is). Otherwise perhaps some of our German forum members have been to the museum and have photos available. They could be used for detailing the interiors of the earliest U-Boote such as U-9.
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