I can confirm that
The Type 38 Arisaka
, by Francis Allan & Harold Macy is excellent,and at least as of late last year, is still available from the authors. Spiral bound, but beautiful colour photos. That is of course for the type 38, and not the 99, but in for a rifle, in for a carbine! I have had my eyes peeled for a copy of the type 99 book (as well as the Siamese mauser book!) for a little bit.
Now you need a nice type 30 bayonet to go on your rifle! You can find them all over ebay and often at bigger gunshows for between $125-200 for one worth owning with such a nice rifle. Repro slings are widely available, and some are even remotely accurate to originals, but not many. Original slings are out there, but pricey. I managed to score a very solid leather one from a Tulsa show two years ago for right under $100. Good luck! Be sure to send a few rounds down range with it if you haven't already!