I recognize this feeder... I think someone on here a long time ago was going to make one, but dont remember who it was. I wonder if they ever did and how it worked out for them. I may print this off and try it myself, since I need some more.
I also have a couple of bossy ones, one in particular, and the double sided feeders are nice, but I also have some that eat much faster than others, so my winter pastures will probably be split by who needs more or longer to eat, than others as well.
Hmmmm, I might have to take a closer look at this.... could be workable for me too!