Developers hoping to turn the homey Eastern Sierra town into an upscale ski resort said Wednesday that construction of the area's first luxury hotel would begin with the spring snowmelt. Intrawest Corp., a Canadian developer that has spent the last 15 years working to remake Mammoth, said it would erect a 230-room, $140-million Westin hotel. It is scheduled to open in the spring of 2007. Dubbed the Westin Monache, the hotel would be the largest in town and the first to bear the nameplate of an upscale hostelry. It is the centerpiece of Intrawest's planned $1-billion makeover of Mammoth. "The...