The case should not be waterproof, but rather leakproof, capable of preventing water from entering the internals while still maintaining adequate ventilation for the PC placed inside.
QTY hardware:
Intel Nuc-sized PC(fully internal)
Gobo Projector(outside)
Wi-Fi outdoor camera(outside)
USB 4G hotspot Huawei(inside, but technically counts as outside)
All the project constraints serve as features that shape the final case design. The only internal component is a computer; all other hardware is placed outside in such a way that the gobo projector beam can be aligned with the outdoor camera view.