Thanks for the help!
Ok, so far it seems that the Hawken halfstocks used a beavertail cheekpiece and the end cap was poured in place with the ramrod channel exposed for the first inch or two. The Hawken Shop website sells two end caps with one acting as entry ferrule it seems, so there may not be a fixed pattern for this.
The Dimick guns used no cheekpiece and mostly a full sized end cap that acted as an entry ferrule for the ramrod. It is hard to tell if the Dimick guns used under barrel ribs or not from the pictures I have seen.
Apparently, a lot of the Hawkens did not use a patchbox at all. The Leman's did.
The Lemans apparently used the older cheekpiece, a patchbox, and both types of end caps over time.
Apparently steel furniture was the norm for all of them, and that includes the Mountain rifle.
The old original CVA Mountain rifle has the beavertail cheekpiece, a patchbox designed like the Leman guns, Steel furniture, and a full sized pewter end cap that acts as the entry ferrule. The stock is more like the Lemans than a Hawken.
Where to find more information on the Leman rifles? That seems to be the next step. The stock I have is not heavy enough thru the wrist for a Hawken really. It is perfert for the Leman's I have seen.