In my opinions, the scales needs to be more diverse. Right now they are grouped too close together: 32, 40, 44
None of which are really popular scales. In terms of military planes, most people would buy 1/72 scale, 1/48, and maybe 1/200. Otherwise it would be hard to convince someone this plane belongs in their collection.
As for the material, I always liked diecast metal for military planes - and I prefer 1/72 scale. Without more pictures of perfectly side, front, back...etc, I can't really comment on the accuracy of the model. If you want to sell military models, learn from the examples set by the two best companies for 1/72 scale: century wings and hobby master
【 CENTURY WINGS 】 Aircraft Diecast Model --Top page--
Hobby Master
Remember accracy is very important. Good luck!