What was behind those lenses and dual displays? A super-sleek, spring-loaded, dual rack-and-pinion mechanism for adjusting the spacing between the display + lens assemblies.

The use of dual displays was a major advance between Rift DK2 and the Crescent Bay prototype. By allowing each lens + display assembly to move as a unit, the Rift provides enough adjustment to accommodate the 5th-95th percentile of IPD—while keeping other key optical properties intact.

TL;DR: If you have eyes, you can probably use this. Nice.

Next to come out is the LED driver board, featuring all the labels a teardowner/reassemblist could want...