Card Display Frame (Fits Standard Toploaders)

I wanted to put a couple of my cards on my shelf but didn't want to have them just leaned up there, so I made this :) It fits a standard top loader which will give it a layer of protection from dust and other stuff, also makes changing out the card easy. On the bottom it has some 20mm or about .75" cutouts to put little felt or rubber feet on it as well. 

I enjoy CAD and making things, this is all still a learning process for me I am always open to Ideas, Suggestions, and Constructive Criticism.