Question: Our home has real plaster walls. There seem to be quite a few cracks that need to be repaired. We were wondering if we should try to repair all the cracks or replace it all with drywall?

Check the size of your 1/2-in. plywood backing board. Then, cut the fiberglass window screen to be eight inches larger than it in both directions (so there are four inches of overhang on each side).