I like! I like!
I'd love to see the squared off cheeks and "corrected" angle on the rear vanes. But no molded in circuit board.
As for the ears. . . would there be a way to re-do the upper ear cap to make a slightly different set up? In other words, a flat "base" molded into the helmet, then a 2-piece cap.
I would agree with the others above who said make the mods to a casting, rather than your original. 