Hinge Making?

Hi could someone help me…with info on hinge making. I am
trying to complete an oval shaped container, with a goblet hinge.
Also a hidden hinge connecting the halves of a slab of Agate so
that they both open independently. The slab is oval shaped and
sits on top of the oval container. The hinge needs to operate
both sides while securing them down to the container. Any and
all help would be greatly appreciated.

Thanks,
Carol