Step by step guide to build a claymation armature:
https://www.wikihow.com/Create-a-Claymation-Armature
http://joshuamosley.com/tutorials/claymationArmature/armature.html
Armature advice
https://www.youtube.com/watch?v=n-HcsZ_HKYs
Making of Gromit Army
https://www.instructables.com/id/Making-an-army-of-Gromits-Claymation-Mold-making/