Treenet,
I am building a 3' wall around the perimeter of the second floor and the rafters will be on top of that. I am trying to maximize my headroom and interior room by doing this. Otherwise the master bedroom will be rather narrow I think. And I may switch to a 10/12 pitch, design in progress!
Really enjoying this though. My best half likes to see what something will look like before giving a thumbs up or down, thus this software.