Japanese Plastics go well with 1/30th scale Americans (like K&C's). 21st Century Toys made a great set (which I am too busy to photo for a few days - you can sort of see them in our Iwo Jima display shelf in our album). The average Japanese soldier was much smaller than an American Marine. Grandpa was 6'4" (whatever that is in decimals^&confuse). He said he was only a little taller than the average Marine he fought with.
BTW I'm 5'8" so people are always different sizes; of course there are some tall Japanese people!
I just think that Plastic Japanese are very cool.
The patina of the leather, as well as the helmet, should be different from the matte & shaded clothing. Just an opinion.
I like your cowboy idea too. See Swoppets & Britains Herald for some good paint jobs of which we have some fun examples.
Pics on request & all the Best as Always!
Paddy