Few comments:
- Catch can will collect alot of moisture during the winter months as it will be the 'cold sink' in this setup acting as a condenser.
- Your hoses are not rated for oil resistance and will swell/degrade at different rates so pay attention to them over time.
- Should pass emissions depending on the amount of oil-vapor carryover there is though the system. The BMW system uses small orifices and a cyclone style separator.
- Too much vacuum could pull combustion gasses past the rings at low load and dissolve away the oil film leading to premature ring wear.