Hi there!
Our PC
(CLICK HERE TO SEE IT) has the older style sliding windows which naturally lets in a breeze and also the rain. We deal with rain by extending awnings. We'll extend the full width passenger awning just 12" to 18" for a minor windy rain. I read over and over that the frameless awning windows work great with ventilation, but you MUST USE the overhead exhaust fan to get well ventillated.
About dinettes in PCs.....not all dinettes are the same. Make sure the distance between benches is sufficient for your particulars. The size of the table is a good indicator.
CLICK HERE to see the dinette in our 2007 PC-2350. Note that because we do NOT HAVE a slideout, how the angled transition wall is utilized to increase the size of the table and leg room. If the dinette is inside a slideout, things may get pretty tight.
One more benefit to a dinette without a slideout, is the size of the overhead cabinets. They make great pantry space for us.
A few people have special ordered model 2552 without slideouts. They also deleted the 1 foot wide pantry on that wall. The extra linear footage, pulls the dinette benches apart which makes the table nice and big, and also nice leg room.
That is one way to avoid the Schwintec mechanism.....don't have any slideouts.