Thought I'd share with the group my latest modification.

Thread on The samba here
http://www.thesamba.com/vw/forum/viewtopic.php?p=5480877#5480877

Success, and Canine approved..
maybe now Scout won't get banged up trying to put her head out the sliding door slider window.
I made this to be installed backwards to allow the rearmost section to slide, trying to keep Scout to the rear cushion while travelling.
If being made for rear passenger comfort, then make the window to slide in the front half..
*Note the new 3seams on the leading edge where OE has just the middle.
The cuts & shortening MUST be done on the fixed piece to securely retain the frame & glass in the groove.
*Note next time I'll move the new upper&lower seam a little more central to the fixed window.
http://images.thesamba.com/vw/gallery/pix/833612.jpg

Hardboard underlay spacer to fit into Glass groove in Rubber window seal
http://images.thesamba.com/vw/gallery/pix/833615.jpg

Thin Stainless steel sheet overlay to protect the MDF hardboard backer, left straight edge along the frame,
This does allow a little of the lower curve to show, but the Glass rubber will cover that.
http://images.thesamba.com/vw/gallery/pix/833614.jpg

Inside view of the MDf hardboard backer in installed window
http://images.thesamba.com/vw/gallery/pix/833613.jpg

Note that none of the MDf is visible, but I did seal the SS edge with silicone to prevent seepage.
http://images.thesamba.com/vw/gallery/pix/833616.jpg

http://images.thesamba.com/vw/gallery/pix/833611.jpg

I found these paint can openers VERY handy for installing the new frame,
They allowed me to slip it in between the frame and the lip and pull the rubber seal flap a little (1/8in) at a time..
Was slow progress but any progress leads to success.
I would slip in with the hook away from rubber, then twist 180* and use hook to pry/pull small lip of rubber over body frame lip..
http://www.cleanmpg.com/photos/data/646/paint-can-opener.jpg

Dan Stevens
VW Club of Central NY
Annual All VW Show & Campout August 14th
Oneida Shores Park  Brewerton, NY 13029
http://www.thesamba.com/vw/forum/viewtopic.php?t=473168