How to create a gabled shed dormer

[avbiii]

Here is a link to the plan of my existing house (image shown below): https://www.dropbox.com/s/9eikpjqguk6y2qm/house.plan



I'd like to create a plan for an attic build-out involving some dormers. On the front of the house, I'd like to consider a gabled shed dormer, as in the two examples shown below:





It will need to be fairly large. The gabled sections will be set in only about 2 feet from the sides of the house and will be about 12 feet wide, and their front walls will need to align with the front exterior wall of the house (with the middle shed section of the dormer set back about a foot).

I can't quite figure out how to do this. Is it possible in HD Suite 2014? If not, how about using Architectural or Pro?

Thank you.

Anthony