There is the Cache La Poudre Mountain Men (or a similar name) BP club up there. Look them up. Some of the old customers of Cache La Poudre Rifleworks are still around and some nosing around local shops should get you some info.
Look up "Iron Thumb Productions" out of Ft Collins, fellas name is Jan Manning and he is as close to a Mountain Man/Buckskinner as you can get.
He can steer you in the right direction.
Tell him his cousin sent you on his trail.
Thanks, will do.
The chair is against the wall has a long mustache.