Lowe's will cut plexiglas to your specs for free, and they have several thicknesses to choose from. We velcroed it to the bottom half of our door only, to keep the dog out of the screen. Easy to remove when you want more airflow.
2013 Surveyor SP220
2010 Silverado LT 5.3 V8
The world is a great book, of which those who never stir from home
read only a page. - St. Augustine