I am almost on the same wavelength as marlinguy on this one. It IS possible to build up a rifle on an original action that has fallen onto hard times as long as three conditions are satisfied;
1) It must be an action that was originally suited to the kind of shooting you want to do...the Winchester 'walls are my favorites with Ballard right behind, but I would not turn down a suitable Rem Hepburn, Sharps Borchardt, or Stevens 44 1/2 then here's the important part, it must be in good shape when you get it or repair becomes a prohibitive up-front cost.
2) You must have the ability to rebarrel it or have access to someone who does, and if you are depending on someone else this will add time and expense to the project.
3) And perhaps this should have been #1, you will have to devote a fair amount of time to finding the action and going through the building process BEFORE you even get your first shot off.
For the reasons above, I am thinking that building such a gun would be better for your SECOND rifle, and I will go out on a limb and say you would be better off to buy something new and fairly inexpensive to begin with, OR buy a used rifle from someone who is moving up or moving on, and shoot that rifle until you develop a feel for what it is you really like and what features you want to use on the "permanent" gun. This latter method will get you shooting about immediately and will give you the opportunity to find out just what is really going on and what you want to do with the game. I am thinking long and hard about the newly released Cimarron in .38-55 w/DSTs if it will truly be available. I'd rather go with a .32-40, but you can't have it all, especially at that price.
Well, that's my story and I'm sticking to it...YMMV!
the Green Frog