Not far from where Hurricane Charley ravaged entire towns along Florida 's Gulf Coast last August , Kevin O'Brien is building the fortress of his dreams : a dome-shaped home that stands out on his suburban street like some concrete U.F.O . '' It 's not something that is truly accepted yet , '' said Mr. O'Brien , explaining that his 20-by-30-foot home in Venice , about 70 miles south of Tampa , would withstand winds of at least 150 miles per hour . ''