John Martinez may be one of the happiest men in Brooklyn right now. He is part of what is bound to be a cottage industry: putting together Ikea furniture for those who can’t or won’t cope with the sometimes maddening assembly process. “‘We deliver it. We put it together. We make people happy,’ chirped Martinez, an employee of Urban Express, the company contracted by the big-box retailer to offer home assembly services to shoppers unfamiliar with an Allen wrench. The basic assembly of a coffee table, bookshelf or bed costs $30, plus tip, but many customers end up paying more than that for more complicated jobs.”–NYDN