Nearly half of the names on a list of Southern Nevada's most active builders during the 2006 housing bubble are gone from today's roster whether through bankruptcy, acquisition or self-imposed exile. "Living through it, it was such a depressing downward spiral," said Nat Hodgson, executive director of the Southern Nevada Home Builders Association and a former local executive with Pulte Homes. People were trying to make business plans, and they needed a goal, but no one knew where the floor was. "Builders have a much tighter business, and much better overhead structures," said Wayne Laska, a principal of StoryBook Homes, a private, locally based builder that lost 90 percent of its landholdings in the downturn. Of the 20 biggest builders for average monthly number of permits pulled in Clark County in 2005 and 2006, eight of the names are gone from 2013's Top 20, according to lists from Home Builders Research, an analytical firm. Kimball Hill Homes, which ranked No.