Here is a picture of a barrelponics unit that Travis Hughey has on his site.
If anyone would like a manual I can send you a PDF copy. just remember Travis Hughey has the rights, especially to the flood valve mechanism. it was fun and frustrating to put it together but ours is working and I will put fish in it today.
Sammy the wonderful thing about aquaponic is that they are low maintenance and you don't have to know much