So...2 sides of my run that's under construction will be my existing 6' tall wood board fence. It's a well-built structure, pretty new, with no gaps in the fence, BUT it was not made to be predator-proof. How big of a skirt should I put around the outside? Is there anything I should do to the outside of the wood to reinforce it? Also, the run will have a roof, and I'll need to put some mesh between the top of the fence and the roof. The previous owners of the house left behind a roll of 4" x 2" welded fencing...If it's well above chicken level (where there's no chance of a reach-and-grab attack), could I use it for that gap? Thanks in advance for your help.