Joe,
It seems you've done some neat and careful work. It's tough to work from pictures. Until you have a mental understanding of stock shape, it's very difficult to interpret a picture of a longrifle. As others have mentioned, there are some issues in this area, specifically stock architecture. It will be virutally impossible to convey and describe things in writing. Like others have said, it would be good to find some well made original or modern longrifles to study. An option, might be to purchase a well done precarved stock. This could be a defect or second. With that said, many are pretty badly shaped, but there are a few that would set you in a good direction. Once again, it appears you're doing some good careful work. Keep at it.
Jim