Goshikisen--
I'd be interested to know that, too. I do know that in the early fifties the Smithsonian aircraft collection was culled-out and sadly some aircraft got the chop, including all but the nose section of the G4M "Betty"

. Other airframes were offered to interested museums, but of course in the Korean War era there were precious few air museums anywhere. One that did exist that early was Ed Maloney's collection then at Claremont CA; they requested and received (ie., unquestionably, rescued) what is still the only known extant Ki84 Hayate (now in a museum in Japan...but restored to FLY in California in the 60s, using its original engine--!). At the time the Ki84 became available, Maloney's own book on the Ki84 indicates that the Ki45 Toryu was on offer as well. That, coupled with what we know happened to the G4M, makes me wonder how much of the Ki45 was kept.
At any rate, it's terrific that the J1N Gekko is completed, with the He219 to follow. I must make my way to Udvar-Hazy before too long...
S.