If its a true Carbine and not cut down, it would be as they say "worth its weight in gold". Restored to its factory configuration. Gunbroker does have Krag parts. An original stock (in my own opinion) will be the toughest to secure. a bolt assembly wont be that difficult (you said yours has been manipulated). The correct rear sight might take some time but not hard to find.

Do yourself the favor of at least locating the parts needed to restore your Krag to factory. It may be worth the time invested. The 1895 carbine isnt as common as the 1898. I seen 1898 carbines go for $1700 Complete and unaltered from a factory configuration. In your case it may be well worth the effort to at least have the parts to do so. The Krag is also very easy to work on, so swapping parts wont be a pain.

good luck,
Ken