nice, now I have to keep and eye on you. geezI got my chain in the mail and got the top tube welded in. I kinda rushed it so I didn't get any in-progress photos. 10ft of kmc chain should be plenty.
Here is the method I use to "cheat" when i'm fabricating stuff from square tube or angle iron. I cut a wood scrap on a miter saw to figure out what angle I need.
The top tube is the rocker from an outdoor rocking chair. It had a nice curve to it already.