Bought this shed, am very pleased with this shed over all. I leveled the base, built the shed. On the last piece to be installed (sky light) one side would not fit. Off 1/4 inch on one side. It would help if there were two grooves instead of one to screw into on the sky light so if it's off a bit ,it would fit. Just a little leeway. Had to drill holes in the sky light to screw into. Worked fine. Great shed over all.