Thank you all. I got the $75 window and frame off Amazon. Once I was ready to install, realized all my jigsaw blades were broken. But following one of my favorite mottos: "Do what you can with what you've got", I used my Harbor Freight multi-tool with plunge blade. I had to cut the interior and exterior separately, and the corners were a little tricky. But I knew the jagged edges would be covered by the frame.
What a difference the window makes.
Now I'm ready to add more windows! Any of you added windows to the regular walls? How does that compare to adding a window to the door?
And can any one tell me where the electrical wiring runs in my model?