Living Room, Sofa, Concrete Floor, and Coffee Tables The Fosters unwind in the soaring, 960-square-foot great room. The family wanted plenty of space for hosting friends and events, as well as lots of bedrooms so they can rent the house to groups on Airbnb if they like.  Photo 2 of 13 in A Colorado Firefighter Built His Own Shipping Container Home, and Found a New Calling Along the Way