He's done a few similar before, but this one cost just $150.  There's a full documentary  and even plans linked from the teaser video below.

... Calling it a “micro Airstream bike camper”, it’s a 60-pound “home away from home”, complete with butane stove, bread-pan sink, counter, food storage shelving, clothes-storage bins, LED lighting, bed, windows, pee jug, bubble insulation, stereo with MP3 player, and a skylight made out of a 1 gallon plastic tub. ...