The 3 1/2 foot space would be difficult for me to maneuver. There are some good ideas but too many stairs. That takes up a lot of valuable real estate especially when that is all they are used for. Instead of an additional floor, just the space under the stairs should be used. I am in love with the large triangle window. It would let in tons of light. Though I see an area to do my crafts, there is no dining area nor seating to have friends sit.