Thanks for those drawings, greatly appreciated, and all the other info and discussion. Parts came in from Numrich. Iĺll pull the receiver back apart and take some measurements over the Christmas break.

If I can solve the sloppy bolt and trip I may try to talk the owner into getting a double gun smith to fix the rib separation and adjust the barrel / receiver fit. We can tend to the remaining issues on the cheap. Be nice be able to pull it off the wall and shoot it in my opinion.