Thing is Karnak, if this is a 'how to economically model more 'units' into the game' concept, something like the Kawasaki Ki-100 I-Otsu is already a problem on two counts: first the fuselage is different as it had a cut down rear compared to the 61 so you couldn't even reuse the tail really (and the front half is radically different already (and the belly)). Secondly, yes you could reuse the wings and landing gear and surfaces but the Ki-61 AH model looks well outdated compared to the other aircraft and probably needs a remodel anyway, so you'd have to redo that in the first place. Or was this the idea, to look for possible additions when an aircraft (say) is renewed?