Thanks, guys. After I typed out the question and thought about it, I actually do need an attic plan for mechanical equipment anyway, so I went back and chopped all the first floor walls down to their layer wall height, added in a design layer for the attic, traced the walls, fit to roof and voila! The roof for this house is a small to medium sized nightmare already, so this actually solved a couple of problems I was having.
Thanks again for all the quick and helpful responses!!
Cheers.
Jeremiah