If you are putting in new hinges, it may be a good idea to go for pinned hinges instead of CA hinges. I found them to be much more safer. Some Asian ARFs, Phoenix for example, come with pinned hinges even on their most basic airplanes. It depends on the manufacturer. I am with Opjose that missing hinge material may actually be a good thing. I have a Tiger 40 with metal pinned hinges

Ameyam