Matt,
This is for the covered pen down the road. I wish it was for my outdoor pen.... however I recently acquired access to a twin screw water truck so I can water my pen as needed.

Dub,
I have been around some overhead irrigation and didn't really like the idea of using a lift to service any sprinkler heads as the roof is 30' high and the cost of piping enough overhead to get full coverage will far exceed the cost of a portable unit. If the clearance was lower, I think an overhead system might be more viable.