If the op’s rifle bbl is cut and the stock is cut the originalness of the rifle is gone and can’t be recovered. Given enough money, time and with wood and gunsmithing skills a rifle can be made to look as it did when it left the factory or 50 years later. But it will never be ‘original’ again. School Krags were built from 30 inch bbled rifles nobody wanted. They couldn’t give them away. While I would never have holes drilled in a ‘03 or krag rcvr or shorten an original bbl once the deed is done you can’t undo it. I would suggest to the op to do the least amount of new damage and replicate a school rifle with his newly aquired altered Krag. Turn the bbl for the Krag bayonet, properly crown it, mount a correct sight and move the bayonet mount to the correct location. Shoot it often, repeat as necessary. They’re neat firearms.