Not too much on the construction of the stop-motion model of ED-209.Cinefex has the best photos, but no detailed information on the fabrication of the armature.Basically, you just have to figure out A) how to make the joints and B) the appropriate ones to install, and the "know how" to machine them on a mill&lathe.If memory serves, it was machined of aluminum(aircraft grade-pretty standard) and it was primarily hinge joint designs(there may be some ball&socket joints and possibly some more complicated,"exotic joints" made) and I'm not sure what else?The major components were vacuformed for the most part and a number of cast resin pieces and kit bashed parts applied.I think Tippet made 2 puppets,but I'm not sure and they were used in all three films.That's all I can remember really.