Benjamin
The Living Force
It was reported to be an airplane seat but all that's left looks to be the frame, no padding." The frame appears to be all metal " important detail methinks
It's really quite a clever diy. If you look closely, you can see he has the chain running down the armrest frame, under the front of the seat and back up the other side. It looks like it's one length of chain that has been joined together at a height that is easily reached (height adjustable). I don't know what's on the ends of the armrests, but these are resting against the chain at those two points which creates the recline and prevents the chair from tumbling backwards. So, a metal chair makes sense for it's durability. Then it looks like he's wrapped something around the chain above the armrests- tape or cloth?- as handles.