Mark, for some reason the first link you posted doesn't want to go anywhere.
I did some searching around prior to my own reply. The question seemed to be directed towards WW2 mostly, but unfortunately there is very few sites that will give a good Japanese perspective of things, at least none that I could find. All I can guess is that the better sites are in Japanese, but I don't know Japanese of course ...
IMO, its pointless studying the Japanese military for any time period without it being from their perspective. Anyone got any good sources that they've found for WW2 for this?