I'm in the process of buying my building materials for our coop/run. It will be a 4X6 coop with a shingled roof and a 6X12 run with a polycarbonate roofing system. My question is about sizing for the polycarbonate roofing and my 6 foot wide run. Would I need overhang with the run roofing? The reason I'm asking is that the panels come in 2 lengths (8' and 12'), If I just need exactly 6' (the width of my run) I can purchase the 12' and cut in half, having to purchase only 3 panels. If I need overhang, then I'd go with the 8' and trim down to size, but have to buy 6. What have people done in the past with this?