I stopped at Lowe's this morning to pick up the parts to make a simple PVC feeder -- a "U" shape. I went with the 4 inch. I'm planning to use this for my 9 chickens -- well, was, before I priced this out: I bought the following: 2 4 foot long straight pieces for the uprights. 1 2 foot straight piece for the bottom of the feeder -- I plan to cut the holes out here for access to the feed 2 90 degree elbows 2 end caps for the top 4 metal pipe straps to secure it to side of the coop. TOTAL was about $65! I can buy a good metal feeder with a rodent-resistant mechanism in the front that holds about 35 lbs of food for around $85-$90 on Ebay with the shipping. So much for saving money. I may just take all of this back and go with the professional model, it will look a little nicer.