windows in thick walls

[andyjacks]

Does anybody know how I can acurately draw bay windows with chief?
I would like to draw the windows as attached pic.
Chief seems to have real trouble with thick walls.
The lower wall in this 300mm thick made up of 100 block 100 cavity then 100 brick.
I have tried inserting windows but because the wall is thick the windows wont connect casings at the corners. I did try the bay window feature with the same problems. I then tried using pony walls & inserting the windows in the upper wall using a 100mm upper wall. the problem is then that the walls dont connect properly at the sides of the bay.

Any suggestions