Looks good to me. I actually wanted to build something like that.
I actually built a stripped-down version. It used an ordinary Weller iron in a spring-mounted holder that fit on the spindle of my milling machine, and used the X-Y-Z axes of the machine to move the iron. I built a solder feeder with a DC gearhead motor. The one thing it was missing was a rotation of the iron/solder feed, but that actually was not a big deal for the boards I was thinking of using it for. It did NOT work very well. I think one problem was I used too small a diameter solder. Since then, I rebuilt it to use a larger diameter solder, but have not set it up and tried again.
The major problem was if the solder fails to wet to the tip and connector pin, then it just curls around and will never correct itself without manual intervention. So, the solder wire just keeps paying out of the tube but doesn't wet to the next joint. If it just skipped one joint but then recovered, that would not be such a bad problem.
Jon