The frame for the folding chair was built. Next up, time to put in the seat back. I considered a few ways I could create it and finally decided that it might work if I copied part of the top of the back frame and built it from that.
To get a copy of the section of the frame I wanted I selected the polygons and then used the copy feature. Not terribly difficult. It was a little too large at this point, I needed it to fit inside the frame so I re-sized it with the scale transformation and got it to fit as best I could. So I had the top of that section but it didn’t really work as a full back. What I needed as it to be longer so I stretched it out. I selected some of the lower polygons and using the move tool transformed them so that they created more surface area and something close to the look I wanted. I had a little problem on the sides as when I did the original copy I had 
some of the polygons that extended down the legs. This wasn’t going to be avoided the way I did it, I was just going to have to clean it up. It did take a little work though. Lots of moving points.
The way I created the back meant that I had this rounded bottom edge that I didn’t think I wanted. In retrospect I probably created a lot more work for myself. But I first tried sort of flattening it out and the I tried making it concave. Not much of it worked. So I cut a row or two of faces out so I didn’t have to worry about edges and point sticking through the surface as I tried to get the seat back nice and thin. I created a little mess and had to do some serious point and edge manipulation to make it look right again. It’s always fun when it comes to that because it can really make the eyes flip out.
Here are a couple of screen shots so you can see what I look at when I’m doing this. One shot is just showing the section with the point selection tool active and a solid surface look. The other shot is with the wire frame view activated so I can see everything behind as I select points.
The manipulation of the points and edges to get it all looking nice was a time consuming process. I got it to a point and then had to take a break.
But a bit more time and patience and it was looking really nice.
As you can see here I did manage to do something with the underside faces so that they weren’t too awful looking I ended up reconnecting the edges where I deleted faces. Part of the reason for doing this is that, when the turbosmooth modifier is applied, it will do some very odd and annoying things to lonely edges out there by themselves. So reconnecting them to each other allows for a bit better control of what turbosmooth does. Not much mind you, but some.
If you notice on most folding chairs, the back of the seat back is inset some. This is what I was trying to do that I thought it best to delete some of those lower faces. It doesn’t mean I 
didn’t still end up with some issues that had to be cleaned up but I think it worked out pretty good. You can just see here that that side is inset from what it was.
I won’t say it was perfect at this point. Only that it was close enough that I felt ready to move on to the next part. The actual seat. This was it’s own challenge that included at least one do over. Check back for that adventure soon.