If you've got 8 hours or so, you can start here: Stolzer and Son's Gunsmithing Blog Start with part 1(Sept 16, 2011) and work your way forward and it should give you a pretty good idea of how to build an action. At the bottom right of the blog there is a "newer posts" button, there are 6 pages total(36 parts so far). I tried to document it as well as possible. There is a thread here on the forum: 2 Bore Double Duece if you have any questions.

Colin