MISSISSAUGA, Ont. — Cottage Country Building Supplies is the newest dealer to join Castle Building Centres Group Ltd. The store is located in Carnarvon, Ont., about 20 minutes outside of Haliburton and represents an acquisition by the Emmerson family, which operates Emmerson Lumber in Haliburton. Under current owner Kim Emmerson (shown here), the business has been serving local contractors and DIYers in this cottage resort area since 1957…