The local man who is building the 110-unit Merritt Village complex at the edge of downtown New Canaan is asking for time and rationality from residents complaining about a short stretch of retaining wall that has sprung up along Park Street. Merritt Village is not yet 1 percent finished, according to Arnold Karp of Karp Associates, who won approval for the landmark project two years ago following several months of hearings before the Planning & Zoning Commission. “There is a million-dollar planting plan that obscures and hides the walls,” he told NewCanaanite.com. “Before everybody becomes an architectural critic, let us build the project. We’ve put in 215 feet of wall and have gotten a thumbs-up from some of those who drive by and some nasty comments through New Canaanite.