You guys are really tempting me to dig out a Kate from my stash... They are a very good looking plane. The fit on most Hasegawa stuff is really nice too.
But I really need to finish what I have started first...
Bernd, in 1/48 scale, Hasegawa makes an early B5N-1 which is shown as having a natural metal finish with red trim on the box top. It's a really sharp looking plane in those colors. I'm not sure if they have one offered in 1/72 scale.
Your build is coming along very well. Thanks for posting these updates.