Here's a couple pics of one I built a few years back. It's actually in another thread here in the B-I Y section... Built for horses, but a person can make it as tall as you want. I did have a few goats, and they had no problem eating from it.
Built from conduit reels, some angle iron, square tubing from the centers of the conduit reels, expanded metal for the bottom, so as to not hold water, and later on the bottom sides to keep the horse from reaching underneath, and sheet metal top.
Got part of the idea from a cradle type feeder for sheep, but I wanted it covered. Then saw a "Big-O" round bale feeder at the Qtr. Horse Congress, but still no top. And theirs mounted on 6 X 6 posts, where I wanted mine portable, so as to move to clean the paddock. So..., made skids on the bottom from 4 X 6's.
I'm thinking I built it in '05 or '06... I still use it, and it has held up well. At the time I built it, I had approx $100 - $125 in materials. Actualy, I spent more time building a tubing bender to get the 8' radius reels, down to 6' radius.
The ends are removable on each end, so as to load from either direction.
You wil note all the wasted hay on the ground, due to my particular gelding... I now just put enough in the feeder for a feeding, and make them clean it up.
I have had several people want me to build them one... Have most of the materials, just no time as of yet, and new shop not set up yet.

