Edu Puertas of Kinetic Armatures is presenting his work on replicating the Armature for the puppet Sally from The Nightmare Before Christmas
Watch Part 1 of the Series
Watch Part 2 of the Series
You can follow Mr Puertas at his studio Citoplasmas Stopmotion
Original Film Armature built by Merrick Cheney
& Designed by Tom St. Amand
(someone correct me if I have that info wrong)