Lethemgo,
Welcome to the KCA.
You have a very well loved 1898 rifle that appears to have been born in the the month of March 1901.
Whig mentioned that you have an 1894 rear sight, however, it appears to be a 1901 rear sight. A nice close-up photo of the rear sight would help determine if it's a rifle, carbine or rare Board of Ordinance and Fortifications modified sight. A 1901 carbine sight would have a "C" mark on the base, leaf and slide.
Currently, all the parts you require can be found on Ebay or you can look at some of the more common Krag parts sources, listed below, like as mentioned previously S&S Firearms or Grandpa's Parts:
(You need to Login to view media files and links) (You need to Login to view media files and links)For cleaning rifle bores I like to use Sweet's 7.62 Solvent. Does a good job removing copper fouling.
Can't really tell... but has the barrel been chromed or has the bluing been removed?
Looks like a fun project and I hope it shoots well!!!