Very cool! I figured I was the only one on this forum to have one of these in the stash!
Yeah, the Japanese only built one prototype. The hull and turret were mostly complete but no weapon were mounted when found. Information is sketchy but it seems to have been designed to mount a Japanese 88mm antiaircraft gun as the main weapon, which other than bore was a different weapon the German gun and apparently was much less formidable. The tank mounted a separate 37mm gun in the hull front where most tanks would mount a machine gun.
Not sure how effective the tank would have been, it was the size of a Panther and probably would have shared many of the German tanks problems with weight and lack of dependability. They also had a Type 4 prototype about the size of a Sherman or T-34 that probably would have been more effective.
Mississippivol: Yeah it would have outgunned a Sherman at least. Though by the time Operation Downfall (the invasion of Japan) started in 1946 the Western Allies would have had fairly large numbers of M-26 Pershings and Comets with the Soviets invading in the north with IS-2s. Though by '46-47 the Soviets would probably have IS-3s in service and the US would have pushed ahead with scratched projects like the T-29 and T-30 heavy tanks.
GM: Finemolds split off from Tamiya years back, I believe Tamiya does box some of their products but they are separate companies.
USMC6094: Would love to see you build the thing. As I said picked up one last year as a birthday present to myself. Funny, I've seen outrageous prices for the kit everywhere but Hobbylink Japan.