A Westy just parked across the street from me.  As I have noticed from time to time, the Westy side window configuration is different from the Tintop configuration, presumably for enhanced ventilation while camping.  For my Tintop, there is a legit 16.5 inches of open width...just measured with tape measure.  I'm trying to understand how VW determined to make this modification.  Seems pretty complicated to do so.  So....what is the open ventilation width on a Westy side window?  

Not that it matters much, but I made screens that attach to side windows with Home Depot stuff, and sheet metal screws that anchor into the rubber seal.  They have worked great for over 30 years.  But was curious about why the design difference?  I think Country Home Campers built and attached side screens exactly the same as me.  Maybe some minor differences on bug proofing at the sliding edges (for instance, I glued onto the edge of screen frame a specifically cut out edge of thin flexible plastic material to totally make mine bug proof, they match the sliding aluminum frame exactly; also used a bit of black foam rubber strip on interior perimeter for compliance); mine work great, but they are just normal screen material, gray fiberglass stuff, not the No-See-Um kind with super-fine woven mesh holes, although I could do this modification readily.

Just fodder for discussion....but still curious.

Rich
San Diego