Thanks for your interest in my quest.
Yes, contacting the Museum of the Fur Trade for more information will be my next step.
The drawings offered by the Jacobsburg Historical Society are of two different rifles they identify as "Fur Trade Pattern" and "Philadelphia Pattern".
The fur trade version has normal Pennsylvania buttplate and triggerguard (non-scrolled) and a large cast, unengraved, four piece box. I've read that box style was reserved for the AFC contract.
The Philadelphia pattern looks fancier: a pierced, engraved box with pineapple finial.
Both stock profiles have curved comblines.
Any other leads on Mr. Crowley or his drawings?