You just described EXACTLY what we have at our house. My wife found pieces of 4 ft by 18 in plywood in 3/4" years ago that were leftovers from a nearby place that makes large pumps and has to box them in 3/4" plywood. 4 of them stacked one on top of the other will cover each of our front windows....it takes 3 for the side window. I labelled them, then drilled holes and placed anchors in the cement block. Takes my wife, daughter and I about 2 hours to pull the wood out, get it up and tighten it down with wingnuts. Have special boards I made for the slider in the back and a couple of smaller windows. My neighbors house is vacant but he cut 1/8 plywood boards that I can slip in between his window bars and screw into place in less than an hour. It really pays to have this ability. Mom has custom aluminum shutters that can be attached in a couple of hours. if you haven't yet...do it! whatever it takes so you are prepared for the inevitable...maybe not this year, but some year....