I do not know where you could find instructions but I used to have a pincushion I think like what you are talking about when I was young and I thought it was the best ever Barbie chair
. It had a tuna or catfod can for the seat of the chair, and then for everything else it was just cut out pieces of cans. I don't know what kind of cans particularily but it looked like the kind you get canned hams in, if you know what I mean. I think they just flattened out the cans or cut out the flat parts, and then using a template they cut out the pieces they needed. Like a croissant shape for the back of the chair and then longer but kind of thick strips for the legs and to attach the back to the seat. (As you can tell I am not up on chair terminology
) I think to make the scroll work they used like the ham can key thingy to "roll" the strips of can into the shapes they wanted/needed. Maybe solder the pieces to the seat part to make it stay. Then glue some fabric to the back part of the chair and stuff and glue fabric onto the seat part and voila! really cool stuffs. I wish I still had that chair, btw. I hope maybe this helps you or maybe will inspire you to come up with your own instructions if you can't find the real deal. Have a super day!