Dear Rick -
Greetings - just a quick note - the comment above brings out an interesting point.
Since I often render with Maxwell after the model is built, I have also used the trick of push/pulling with the + on to make the "inside" of a window. Its a bit of extra work but, given the tremendous fantastic power of your script I am always quite happy to do it.
BUT
Why not edit the Windowizer to make double-sided windows? Perhaps, if there is no "second" or "inside" wall, it could just offset the original face by the required depth (ie., set Wall Thickness) and then ZAM! Its all ready.
What do you think?
Looking forward to hearing from you.
Best wishes from Berlin,
Jason