Pete,
re: 1. Having been a professional photographer, and owning a number of Lugers myself, I can imagine two guns being taken down for direct comparitive photography of a particular part--in fact, I have seen exactly those photographs.
If I may further speculate from my experience, two Lugers would probably be disassembled on a different surface than the actual copy stand from which the photographs are made. The photographer might not be the only person handling the guns--an assistant might be handling the parts, or the respective guns' owners. The course of such a photo session, particularly if a lot of different aspects of the guns are being documented, tends toward the kind of inattention which results in misassembly. And yes, that's pretty sloppy work.
re: 2. Without directly answering your question, Still's Acknowledgements in "Imperial Lugers" at least illuminates the situation. For the authoritative answer, ask Jan.
re: 3. Pretty low-odds assumption, that. Most likely answer: because there aren't any, and nobody's gotten around to faking them yet.
--Dwight
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