Michelle Kaufmann's new mkHearth is a semi-prefab house that evokes old-timey barns and vacation-destination chalets. Like all of Kaufmann's celebrity-architect-branded housing products, the mkHearth is a panelized, earth-friendly building that essentially costs the same as similar (if less sophisticated) custom-built homes, but due to efficiencies in transportation and manufacture, saves time (and ergo, money) from contract to construction and completion.