Kevin,
I made it out of two pieces of aluminum tube, one inside the other. Here's a thread on PT.com with a pic in it (I can't find my own copy any more).
http://www.pro-touring.com/forum/sho...ight=fuel+vent
The breathers are mounted upside down on the underside of the trunk so that any smell would be outside the car. You can see the lines going to them. The other line is the rear housing breather.
jp