First off, re-submit this in scenario format... There is absolutely no reason for this to be in campaign format, as we can't do anything with it then. OK, on to the review.
The map itself would be frustrating to use as a template, as it is fully detailed and has civs. I wouldn't recomend it. As a SP/MP scenario, it holds up fine. Everything works and is a good change from a standard s RM game.
This does have a couple problems map-wise though... Japan is as flat as a board, China doesn't have much in the way of mountains, and the Bo Hai bay is missing. It should still work fine in a Choson vs. Shang scn, or even a Shang vs. Mongol scn. It really depends on your own taste.
This map doesn't hold up well as a template but does hold up with a notch above average in most maps. I'd reccomend for a good change from the standard RM. It could also come in use somewhat as a template, its all in your taste and your thoughts.
Overall: Decent, clean job. You've set your first step in the right spot. We'll see where it goes from there.