I wouldn't worry about choppers, there are already so many good ones and that seems to be the popular thing to make.
Could you instead work on new island objects like older wwii era buildings and stuff, windmills, new houses and more.
Or actually, what I'd like to see implemented, and a lot for a long time, is a pickup truck with an m60 or m2 in the back. It'll have gunner, 2 passengers in back, 1 passenger in front, and a driver.