I actually made one out of a small refrigerator, I cut out a big window and put a piece of plexiglass in it. I had to use lots of duct tape to clean up the edges, and then I had a problem with condensation on the window. This one actually has 2 panes of glass, so even the door is insulated. Edited to add: I tried to find some pictures showing the other one I made, and I couldn't.
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