empty opening with arched top and slanted reveal

[Anonymous]

Hello!
I am modelin one gothic fortress for renovation purposes.
So every opening are as described in topic title.
So how to get that without having window in 3d?
I know how to get it in 2d. I use classic windows and in model view options turn off windows. Is there that option for 3d?
or is there some custom empty opening?

here is the fortress I have to model:
http://www.webdesign.elstro.hr/wp-content/gallery/gradevine/garic-grad.jpg
here is a movie:
http://www.youtube.com/watch?v=lm4cwuudy_g
I have to model only the main building.

please help me. it is urgent.

[Laszlo Nagy]

I am not sure this is a bug.
It seems to me that on the right image not the correct nodes are connected to each other and this causes the surfaces to be distorted.
It seems to me that if you rotated the back profile polygon in its own plane 180 degrees the correct nodes would be connected.
Maybe you created the profile polygons by SPACE-clicking the outline previously drawn.
To avoid such a situation you can just draw the profile polygons instead of SPACE-clicking.