Footeconst3

Is there a quick / simple way to draw a hoop style building in CA? I am designing the interior for an out of state customer and they want a second floor so it would be helpful if I could draw the building in order to do 3D interiors. I will be drawing the building to assist with the foundation, end wall, lighting infrastructure and a future addition. Any suggestions are appreciated before I take the long way around the block. Thank you!