Working with Archicad gets one tied down in details. Working with graph paper cut-outs that represent rooms allows one to quickly rearrange the design. Hannah and I both liked this layout. The top setup is the second floor.
House Concept using graph paper cut-outs. First floor is on the bottom.
We shall soon see if this works out in Archicad.
Design & Construction of Spartan & Hannah's Home 
I remember my mother using this technique when she planned the dome layout. It was a lot of fun to rearrange and then imagine.