I don't have any experience in doing that, but I looked up some information for you. I can't say I have really read any of it yet though, but hopefully it helps you out.
Fantastic Fresh Fodder (by Dr. Lynette Morgan, 2011-09-01)
HYDROPONIC GREEN FORAGE
A few Videos, mostly of commercial fodder producing systems, but show a simple and expandable design structure.
Almighty Fodder Systems - how the system works
Fodder Solutions
Transworldfoods.flv (what particularity interested me was the introduction of UV light to control bacteria and fungi)
DIY Fodder System 5.0 Pt. 1
DIY Fodder Pt. 2
Fodder Growing System for dairy goats at New Forest Farm (I can easily see something like this being used with removable trays for easy rotation and cleaning)
Barley sprout superfood for livestock