So for something like this projector to work there are two things that are critical to be set and maintained throughout usage.
Focus and Orientation/Aim
A pinball machine gets jostled around constantly during play, so much vibration. Then you have routine maintenance...playfield going up and down, etc. I am sure they put some thought to this but I am really curious how this will hold up over time. To get this to work on so many different surfaces, some extremely small (the tiny standups for example), they need to really ensure that this thing cannot lose its perfect position or focus...
If its off even by a hair the entire effect could be compromised.