Jay,
Smart Parts
http://www.ddgi.com
will allow you to do the trim as you want with the exception of the upper sill extending past the side trim. With its ease of use, I would take a look at it. I've used it for years.
In a situation such as yours, if its just one home, I would either add a slab/wall piece for the upper sill, or add to the script a piece.
Nothing agains D&W builder, just another option.
Erika
Architect, Consultant
MacBook Pro Retina, 15-inch Yosemite 2.8 GHz Intel Core i7 16 GB 1600 MHz DDR3
Mac OSX 10.11.1
AC5-18
Onuma System
"Implementing Successful Building Information Modeling"