BTW, if you are skeptical about the need for a catch can just remember that we are running 5W20 fully synthetic (I hope!) motor oil which is very easily picked up and moved around.

Here's pic of a working can:

Click image for larger version.  Name: 1 week.jpg  Views: 0  Size: 49.5 KB  ID: 1167

I, for one, don't want the risk or reality that oil is passing into my supercharger!