Okay, I really didn't like the window towers in the last version. They just seemed too heavy and massive and tended to overwhelm the surrounding architecture.
I've come up with this new approach. To me, this is a lot better. Note that I only changed the left side, the right side is the original.
http://www.quaketastic.com/upload/files/screen_shots/Wish13_t3.jpg
I really like the way this looks. The new brushwork is more lightweight but still pulls the upper and lower parts together very well. Unfortunately, marksurfaces went up quite a lot (32,354) .
While it's not perfect, I think the final version is somewhere in this screenshot, I just need to tweak things a bit.
Ideally the upper window thing would align with the lower buttress, but there's not enough room for that. I'm thinking that the whole central area needs to be widened by about 128 units, but the surrounding parts of the map are so close that it would require a massive amount of work, so that's probably not going to happen.
At this point, I think I need to go back and fix any problems with actual gameplay instead of fiddling with brushes, then take a shot at at reducing marksurfaces (which are actually the most illogical of all the original Engine limitations) and finally, tweak the detailing.
There's also a lot of texture work to be done.
I have really appreciated all the comments, please don't stop.