A fun experiment.
Commercial Level-D simulators facilitate the use of a collimated display because they allow for an image to project into infinity providing the illusion of depth and perspective. To achieve the effect, mylar is wrapped around a parabolic structure and a vacuum is used to shape the mirror.
To experience the effect a Mirascope toy (“3D Illusion Maker”) was utilised along with a smart phone screen playing back cockpit videos. The end result was surprising, and mesmeric for such a small device.
Implementing a collimated display for a full scale flight simulator will be a challenge, but something to consider for your flight deck as it can greatly add to the immersion.