I have an avistar for FMS. but it's just a gp trainer with a different .bmp file (skin)
that the aurther made.
The fuselage looks a little too short to me.
It dosn't fly like it or look like it execpt for the skin. You can adjust the perimeter.

A trainer that has a closer profile of an aviastar is the irvin tutor or basic trainer.
the perimeters are set up so that it flys more like an avistar, it'll rolls more.
You're better off getting the irvin file because the way the .bmp is mapped,
becuase the bottom of the wing has been mapped out to have a different
scheme than the top of the wing.
You can easily change or paint the skin scheme to it look like an avistar,
or scheme it anyway you want.

If you must..really want to look, like and avistar zoom up close, close You can
round off the nose of the fuselage a little. Via the maq.