Edited floor plan and image:
The porch is under the main roof, but I put it in a seperate group from the main house - because it doesn't have outer walls and it'll require intricate modeling work/detail.
When I tried to raise the "House Walls" with the push/pull tool, I couldn't do it until I exploded the group. Why?
I'd also like to know if grouping things this way will affect my roof attempts later on?
Future questions will be based on this blog post :-)
Orinal floor plan and exterior image:
