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.
https://images.homedepot-static.com/...113-64_145.jpg
Then using 1/4 round molding to hide those and give it a finished look. Will be using Gorilla wood glue to atatch.
https://images.homedepot-static.com/...730-64_145.jpg
Also the acrylic sheet would be like 11" X 30"