I'm pretty sure that the new windows (in the US library anyway) cannot do the all mitered (picture frame) casing. You can omit the sill but not get the casing to wrap the bottom properly. You can turn off the sill and set the apron to match the casings. This leaves seams at the bottoms of the side casings but is otherwise what you are looking for.
You could also:
1. Grab a copy of the old one, rename it, and put it in your office or project library.
2. Turn off all the casings, make the frame thick and extend it past the wall. EDIT: Nope, the frame only thickens at the sides and top
3. Make a separate casing part and insert it with the AC11 part (with the casings and sills off of course).