[x4btr]

Only for curioisty, what exactly you need? a 3D rework?

I think that the work required would be much less than that on offer, for example, in creating the "Hs 123" or the "Tiger Moth". The turtledecking aft of the sliding canopy needs slight reshaping, and half-round glass areas to be placed therein. Yes, this means to the existing 3D model, in the same way as the aircraft models mentioned.

To expand Vanirs comments, you could equate the lack of these primary Yak-1s as being similar to the sim omitting the Bf 109F model. It would be seen to be unthinkable-- going from the E to the G. And yet, this Russian team has done the same to their own air force!

I think that speaks volumes, personally....