Ah, we all get some help.
That is a nice gorget. Perfect example of the period. Annoyingly, the parts right next to the joints are patched. The idea is like almost all other gorgets like it. A wiggly rivet on the left shoulder, and a pin in the rear plate and a keyhole in the front plate. The rest of the plates float on leathers and then the top neck lame has a hinge on the left side and a pin in the rear that engages in a hole in the front plate.
The nice ones I have seen have the hinge made as part of the upper neck plates, cheaper ones have a separate hinge. I am sure that there are high end ones with separate hinges too, but it is a fun feature.
This one has a more original set of pins on it:
http://www.allenantiques.com/A-25.html
This one is similar:
http://www.allenantiques.com/A-110.html
I feel it was originally a nicer one with upper plates that was re-worked into a simple gorget.
The other gorget on my site is similar in overall construction. It seems to have been pretty commonly done the same way.
Keep going, add more plates. You need a really big cool roll on top.
Wade