Prefabricated home construction has come a long way. Just a decade ago, prefab houses were synonymous for cheap and tacky. But today, more and more architects are designing factory-built homes -- and sometimes winning awards with them. Sure, you can still save a little money -- maybe 20 percent, compared to building the same house the conventional way. Lots of buyers put those savings toward other bells and whistles that make a home more stylish and appealing. The Twin Cities is a good place to explore prefab's cutting edge, with two local architectural firms leading the way: FlatPak and Alchemy Architects.