Rick,
That looks really nice. Don't jump too fast though when you get started. If you want to maintain the authenticity of the rifle and the whole package, do a lot more research.
The only guns I have ever worked on to restore, I have ruined any historical and therefor $$$$$ value of it. One I really have to kick myself in the head over would have been worth quite a bit of money if I had left it alone.
Removing rust and grime should be a slow, slow process. If it is not going fast enough, you are probably doing it correctly. Swelling and repairing cracks are a sience.
I wish I could tell you how to do it, but I can only tell you how not to do it.