I am trying to add a bonus room to a single story house...a 1.5 story house and I keep running into problems... I only want a 2nd floor above the garage, but there vaulted ceilings in other rooms. The current challenge is adding transom windows in the vaulted rooms...The model has the upper floor stucture cutting through the transom or not allowing placement of the window beacause the floor of the upper floor is there...these are areas that should not have a floor above.