Hey Zombie. G10 is a composite material. e-glass (similar to fiberglass) is layered in a press. Then an epoxy is mixed up and put into the press with the glass. The press closes and applies pressure until the epoxy is hard. This is an oversimpliffication, but it will give you a general idea.
Then the sheets are removed and handles are cut out of the sheet (we use a lazer). The handles are then processed with CNC equipment milling out the nesting for the liner, milling the outside chamfer, reaming the holes and milling the holes for the stop pin.
sal