On Saturday I decided to actually incorporate one of my arrow window designs into something I already have. In this case, it was a city wall, 24 studs wide, which would accomodate 4 arrow slits according to my design.
I won't show you the result, but let me be very clear....
MY ORIGINAL ARROW WINDOW DESIGNS DO NOT WORK!!!!

So, I kept fiddling and have come up with a new design which does not strain the fit tolerances. In fact, it fits quite nicely.
Post mod:
http://www.brickshelf.com/cgi-bin/gallery.cgi?f=74227
Deep links:
http://www.brickshelf.com/gallery/Wag/C ... ment01.jpg
http://www.brickshelf.com/gallery/Wag/C ... ment02.jpg
http://www.brickshelf.com/gallery/Wag/C ... ment03.jpg
http://www.brickshelf.com/gallery/Wag/C ... ment04.jpg
http://www.brickshelf.com/gallery/Wag/C ... ment05.jpg
I used 1x4 plates and 1x1 round plates as those are what I have in abundance at the moment. Using 1x3 plates will allow for a solid row of bricks along the bottom level.
You can also see the original crenalations (sp?) that I'm planning on replacing. I haven't decided on what I'll finally use to top this new battlement design.
With this new and workable design it will not take much effort to create a fully enclosed arrow window similar in design to my original one.
LMKWYT
Alan