London-based Karen Boswell decides to design and build a stylish houseboat to moor near the Grand Union Canal. She's gone to town on her modern industrial bathroom design, indulging in a set of twin showers as well as a bath. But space becomes a problem for the build team, who are tasked with constructing Karen's rather large bed. In Portland, Oregon, fed up with her cramped city apartment, Marsha Olson sets out to build a spacious two-storey floating home on the idyllic Multnomah Channel. Will the dramatic 10-month build prove worth the effort?