Here's my DIY fogscreen display. The cost to build this is relatively inexpensive (excluding the pico projector because I pre-owned it, in USD the total cost was $110) and easy to build. I use corrugated plastic for the housing coz it's cheap and easy to bend into shape. The app displayed is my solar system guide video game made using Unity.
PC power supply
I just use a small pin to power up the power supply. Google for more info on how to power the PC power supply using a metal pin
You can use humidifiers or dry ice as alternatives
12mm PC fans (90CFM or above)
Used metal fence (got this from the backyard)
Metal grates for the fog vents. Could use bits and pieces of corrugated plastic or anything solid as an alternative to hold the fog vents open
Another interesting aspect of this project is that the hardware also includes fan controllers which allows for fine tuning the fog's density. By independently controlling each fans, the fog density could be improved by limiting the fans' speed to a certain arbitrary degree; the optimal display setting seems to be achieved by making the four fans facing towards you at a higher speed and the other four fans away from you at slower speed. At higher speed, the front facing fans reduce jitter effect while the fans at the back increases the fog's density. If all fans goes on full speed, the jitter decreases but fog density is lower, making the display less opaque and the opposite will occur if the fans goes slower; jitter increases, fog is much more dense meaning more opacity.