The stretch of U.S. 65 between Ozark and Branson (MO)has some of the Ozarks’ most impressive scenery. There are lush, rolling hills, distant horizons and, if you look east, one of the biggest homes in the United States. A house currently under construction near Highlandville spans almost a full acre from wall to wall, on a 500-acre site. The ambitious project, nearly three years in and barely at the first floor, totals 72,000 square feet. Putting that figure in perspective might require a few comparisons. According to the Census Bureau, the average new home size over the last five years...