Googling for Holland & Holland double rifles may produce results as well. Or double riles in general, as they tend towards being expensive and ostentatious.
You can buy books with this sort of thing in. full of it actually. My coworker ordered a bunch from Amazon last year, I scanned them and used those for a gun I did. The tricky part is making them fit complex shapes though.
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http://www.tandyleatherfactory.com/en-usd/Leather-Craft-Patterns.aspx
Often you can find stamp samples and use those as brushes in sculpting apps...
Googling for Holland & Holland double rifles may produce results as well. Or double riles in general, as they tend towards being expensive and ostentatious.
can u send me your scans?