November 6th 2013 UPDATE
I had to build this around the feeders to keep the goats from #1. jumping up and standing on the top of them and contaminating the minerals with their hoof scrapings. #2. to keep them from butting them down.
I put a couple of hinges on the top plywood so it is easy to open and fill. This has stopped the problems I was having with the two things mentioned above.
One feeder is filled with baking soda and the other with a mineral mix.