Most people vent the PCV. However, it should be hooked up to the intake so that the vacuum created in the manifold draws the oil/water mixture out. Also, although some would leave the PCV Valve out of the system, it is a good idea to keep it there so that pressurized air doesn't get into the crankcase. I'll try to find some pics of a relocated pcv valve..
Here is a pic of my catchcan, altough I didn't use a block off plate system.