Alex,

Here's a link to the 2 Bore Jones Underlever I built for a customer a couple years ago:
2 Bore Jones Pictures
There is a link at the start of the post that will take you to my website and the 5 pages of detailed documented build.

Here's a link to the current Big Bore Project I am working on:
Video build Log of 2 Bore Jones Underlever Side by Side
If you go clear back to the beginning there is about 7 hours of video documenting my current project.

Hope this helps.

Colin