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You might contact Leonard Bull in Trinidad Colorado. He has worked on them a long time and he was an instructor for many years at Trinidad State Gunsmithing School. Leonard teaches a class on building Farquharsons from kits that he has manufactured.

Hoot

Grenadier

What calibre is your Rigby, and how about a pic or two?

Try Mark Penrod. I have a Farquharson that he worked on (it was for a prior owner, not me) and he did a fine job.

I like this type of work very much. If Mark can not help you, go ahead and contact me. It all sounds like pretty straight forward work.
Steve