Sorry to do this, but I can't remember who asked, nor can I find the email where someone asked if I had a "good" picture of where I drilled & tapped my water pump housing to feed the oil/water exchanger.  I promised to take a picture this weekend and post it. 

As reference, the alternator seen in the picture is in the stock location on the 20B WP housing and the K&N filter is installed in the empty CAS hole left after I converted to the Renesis type CAS.  The tap is in the wp housing just as the coolant turns the corner to enter the front side iron.  I put it there because it is a high pressure area, it has just been through the radiator, and that's the only spot after the water pump impeller I could find where it would fit.  It was tapped for 1/2" NPT.  The black heater hose is the outlet feeding "cool" water to the oil/water exchanger.  

Thanks,
Mark S.
Lancair ES-20B - 36 hrs