I made a see-through LCD screen. It is very easy, if you have the right screen to begin with.
I had several cheap VGA LCD screens. I took one apart, and removed the back-lighning.
Then you need to consider where the electronics are situated. I my case the electronics are on a circuit board, which you can put in an L shape behind, or vertically with, the screen.
You can tape the construction to a window, and enjoy a see-through screen!