Hi!
Thanks for Japanese translation! My guess, that the model demostrates some ideas, that could incorporate twin-engineed aircraft, based on Farman' design. I noted, that:
1) fuselage cross section in rear part was not a simple rectangle, but polygonal or with curved parts
2) landing gear has been extensively redesigned - nose gear added, main gear moved to the rear
3) vertical fin added at the bottom of fuselage up to tail skid
4) armament arrangemen has been changed
And one more thing - I didn't knew, how precisely model of new aircraft have been match the planned designs. Perhaps, some details isn't too much accurate?
Anyway, F-50 also match my first guess of the model
P.S. Any chance to see F-60' pictures in Japanese service?