Welcome Niall
Apart from the Kindig, Long Rifles of Note, etc, I have seen few photos with the details you asked for.
In Lindsay’s “The Kentucky Rifle”, page 8, there is a picture of the engraving on the butt plate return.
An article in Muzzle Blasts, Dec 1966 shows a few details of the carving around the lock panel and the lower forearm.
Two rifles are pictured in “Kentucky Rifles & Pistols 1750-1850” but lack details.
Perhaps the best details I have seen are in Whisker’s “Behold the Longrifle” (details of toe plate and trigger guard engraving), and “Behold the Longrifle Again” (very fancy toe plate, forearm incised lines and tang).
The KRA’s “Kentucky Rifle Photographs Volume I, Issue I” has the same Fordney rifle as in Lindsay’s book. The nice part here is that you can magnify the pix w/o losing detail so you could pick up some of the details you want.
All the best
Paul