I've had mine down a few times. I pulled the screws and for any gas lines through the cover I slice a single cut from the line to an edge.
The problem I've found is that on reinstall it's hard to get the old screw holes lined up as the coroplast is fastened around the outside edges and sags in the middle. I overcome this by using a small piece of plywood and a floor jack. The jack and plywood go in the center of the coroplast and lift it up. This takes the sag out of the material and suddenly the screw holes line up again.
