In all likelihood, you will find/have all or none of the action parts...the missing parts come out when you remove the mainspring, then the little screw in that small hole at the bottom of the action to retain the lever axis pin and said pin, then everything else you list falls out in a group. You might look in the top of the tang and see whether the sear on its pin and the sear spring on its screw are still present.
If the action was originally a .22 rf, it should have a square slot and a screw hole in the front face of the receiver (where it is covered by the fore end wood) to mount the so-called kicking extractor. If not, the rifle may have been a centerfire originally. No biggie, but the block and extractor you need will be determined by the final application. I like the .25-20 (either SS or WCF) for the low-wall, in fact I'm building a low-wall with a Green Mtn. bbl right now in .25-20 SS. The .25-35 however is probably a bit overly ambitious for that action.
The good news is that your area was and is a bit of a hot bed of single shots and schuetzen, so finding someone fairly nearby shouldn't be too great a struggle. If you can't find sufficient pictures and instructions right away, drop me a PM and I'll be happy to Xerox some and send them to you. Likewise, the parts mentioned change hands frequently (at least compared to most other SS parts) and shouldn't be TOO hard to find. Down here in Central VA I've had to find each of the things you mention more than once for projects I have done.
Continued best of luck, and keep us informed...we all seem to get a certain vicarious thrill out of each other's projects and successes.
Regards,
the Green Frog
PS With regards to your stock, the high-wall stock can be fitted to a low-wall by removing excess wood. The reverse is not practical in most cases. Is either piece of the original stock present and usable?