I thought this might be of interest… I made an LED array projector from a Unicorn HAT HD and an Ektanar 102 mm lens from a Kodak carousel slide projector.
To build it, I attached two pieces of lumber at a right angle and mounted a Raspberry Pi Model B+ to that with set screws. I used 2-inch diameter pipe clamps to secure the Ektanar lens to another piece of wood. Then I combined the two sub-assemblies using c-clamps, which can be loosened to focus as needed.
I attached a segment of dried bamboo for rain cover, and put rubber stoppers into the exposed ports of the Raspberry Pi.
I mounted the completed projector to a Sony VCT-R100 Lightweight Compact Tripod with a 1/4"-20 x W3/8" x L7/8" coarse thread coupling nut.
Finally, I threw a couple of bolts of white fabric over an old lemonade stand to serve as a screen.
I adapted show_png.py in the Unicorn HAT HD examples to display a short holiday animation.
Like a movie projection, the image isn’t particularly bright and needs to be isolated from ambient light. But it’s striking!