Fan Cage Dimensions?

Im planning on building one in ag at school but I dont know exactly how to go about it. I know the two stall dividers and 8 ft and 42 in. in the front and 30 in. in the back so I can handle those. And the description also says its 6' 2" in the front and 6' 7" in the back, but how wide is it? Like 8 feet or something. And how would be the best way to connect the L shaped pieces?

So if anyone has ever built one of these please help me out here.  (thumbsup)

You will probably want to make it adjustable like the sullivan ones.  We have the aluminum set and it goes from 8' or so to about 14' -- maybe use 1½" square tubing on the outside and 1" on the horizontal slip piece or 2" outside and 1½" for the horizontal slip piece.  Whatever fits the best.