Link? That's not a bad idea, but smells of unneeded complexity to me, when a simple system that's well designed will do the job perfectly well. Still, worth having the option in the back of the mind in case it's needed at some point.
Data point: My truck, 2.0l, 8000 RPM, 18psi, ~400hp @ crank (+/- 50 depending on who you ask and/or state of tune/fuel/etc), 2 to 3 times factory output level, NO catch cans/separators, two fittings/hoses with about 12mm ID (apologies for metric on TB) routed up at about 45 degrees for a few inches, then horizontally, then down to a coke bottle and methylated spirits bottle (LHS and RHS respectively). No oil or water or sludge or anything in there, because nothing comes out of the engine. It's moving slow enough that it collects inside the cam cover labyrinth and stays put. On the other side, without the labyrinth, same deal - not enough velocity to carry heavy oil droplets out of the engine up hill.
This is a PCV system, ie, clean in, dirty out, or dirty out both sides, depending on operation mode of the engine. On the right, the long chamber with many redirections inside and around 1/2" height inside is for the free vent to the inlet pre throttle/turbo. On the left is the chamber setup for the to-plenum valved side. And in the second photo is my additional passage out for greater flow at lesser velocity, only split by a vertical division that prevents the intake cam spraying oil into it.