'George' - From what I know and can see in your photos, you have a pretty righteous looking model 1892 Kragrifle!
You should definitely search out a correct model 1892 bolt and replace the model 1898 bolt and extractor.
If it were mine, I would leave the model 1896 rear sight and magazine cut-off in place. (I believe them to be legitimate updates).
A model 1892 rear-sight and earlier style of magazine cut-off, kept detached in a display box, would make nice companion pieces to show the evolution of the model 1892 rifle.
You've got a good one. Thanks for sharing!