We have not made any significant decisions that could cause large risks yet. Our main risk is that the project will either work or not work. There is no partial success if the volumetric display breaks. We are mitigating this by being very detailed in our design decisions and talking them through. For example, we spent some time reviewing the parts list.
One design change we made was moving from an ESP32 for the display controller to a Raspberry Pi. This is due to the fact that the ESP32 only has enough GPIO pins to control one display. One slight downside is that without RTOS, it is possible our display driving logic could have slight jitter. However, looking at previous volumetric displays, using Raspberry Pi’s did not cause any visible image tearing.