Hundreds of construction workers in booming northern British Columbia will take up residence this week in unique digs on board a cruise ferry revamped into a floating luxury hotel. The aging ship will help relieve a housing shortage in one busy Canadian port town already bursting ahead of a promised energy boom that could last more than a decade. The Silja Festival - a Baltic ferry made over as the Delta Spirit Lodge - will spend at least a year docked outside Kitimat, British Columbia, where it will provide housing for about 600 workers in town for Rio Tinto Alcan's $3.3 billion smelter-upgrade project, which is expected to wrap up in 2015.