Luxury car prices per array due to development, customization and the type of clientele. We have a mech engineer onsite to adapt the camera arrays to the environment, such as a cockpit or centrifuge, while taking into account the field of views and mounts. Yes it can handle multiple screens and curves like domes, the fun part is working out the geometry to convert gaze vectors into pixel coordinates. Pixel accuracy is a function of the number of camera (6 to 12), distance to the array, and geometry of the subject and array but we can typically discern which button / control / digit a pilot observed.

Of course cost can be substantially decreased if everything was standardized and the mech engineering was done once. BOMs (excluding the high-end desktop computer) is about $2000-$3000. My dream would be to reduce that cost by moving the computer vision to compute modules per pairs of cameras reducing the BOM to < $1000 and avoiding the desktop.