Jcatblum, been looking at that site for awhile now. Lots of good information there and I think that may be just what I was looking for. Thanks for the link.
Erinszoo, that's a good point on the length issue. I hadn't considered that. The only reason I chose that length was because my chicken run is 30' long and I am wanting to build a raised bed along the entire side of it. I figure it will be near a water source, provide afternoon shade for my birds and since I'm out at the run every day anyway I can take care of two things at once.
I appreciate the ideas guys. I think tomorrow I'm going to scrounge around the barn to see if I have enough material to get started on this.
SDS
Please post pics. I'd love to see how it comes out!