Although I didn't build my first one of these until about twenty years after they came out, the Nichimo Ki-45 is one of my favorite Japanese subjects in 1/48 scale. It's also featured in a 1976 issue of SCALE MODELER magazine, so I'm including it here because it's sort of a model kit from my childhood. I built the first one back in 1995 and did it straight from the box, painting it in the usual light gray-green with dark green mottling. For this second go-around, I chose to do an early version without the guns sticking out the top behind the cockpit. I also chose one of the solid color schemes the Japanese Army used - the medium blue gray. I put minimal insignia on it with no squadron or tail markings. This decision was based on some photos and diagrams I saw in Donald Thorpe's excellent book Japanese Army Air Force Camouflage and Markings by Aero Publishers, 1968.
Tamiya has the correct medium blue gray in a spray can, so painting was easy. The decals are a mix of the ones which come with the kit, and from the Otaki Ki-61.
Even though the Nick was a mediocre twin-engine fighter (like the Me-110) I still think it's a bad-ass looking airplane and I'm happy to look at it every day in my office.