We did a feeder pannel type, only went the cheap route. cfpinz pay attention and you might save some money rather than buy one of them spendy pannels. We did it for calves but if you enlarge certain parts such as poles and use bridge planks instead of 2x12's it would work. O this was a long a peice of cement already in place. Take your poles and put them in the ground 5 feet apart. Vary in size of pole and depth put in the ground according to size of cattle built for. example the bigger the cattle the thicker the pole and the deeper in the ground. cement can be pored around post but we just use p-gravel and pack it with a piece of rerod. Then add your boards or bridge planks. Build it to about the height of a round bale feeder bottom so about 2 to 3 foot tall so 2 or 3 bridge planks or 2x12 then leave a gap of about 2to 3 feet depending on size of cattle using it, smaller space for calves, larger for cows. Then you put another board at that height. Then we used small 4 inch wood poles and put those in on the outside about 3 feet from the fence and put 1x12s on those poles about a foot taller than the first height so between 3 to 4 feet. Basically its a box to keep the hay by the fence so that when they stick their head through the gap of 2 or 3 feet they dont push the hay away. Hopefully you get the idea as this plan can be modified or changed very easily. Could be change to make V-neck feeder out of wood also on the fence. Also guardrail couldbe used also instead of bridge planks or 2x12's. Dont but tons of ring shanked nails in it right away. Use the least amount of hardware possible, then quick try it out on what ever it is built for and then adjust so that it meets the size better such as making the gap bigger or lowering the bottom boards, or raising the top board. The box part will probably have to be cleaned out from time to time as fines do build up. If any questions just ask.