So I am going to be using this Acrylic sheet it is .177" thick. Though the one I bought doesn't have the green to it. I will be cutting it to fit into the opening and using a bunch of these glazing points to hold it in place.
Then using 1/4 round molding to hide those and give it a finished look. Will be using Gorilla wood glue to atatch.
Also the acrylic sheet would be like 11" X 30"