At a time when America and the hospitality industry was reeling from the tragic events of Sept. 11, 2001, Thayer Hospitality defied all odds 17 years ago this month as it continued to move forward on the construction of its $600-million resort complex to be anchored by Orlando's first Ritz-Carlton and adjacent JW Marriott. The 500-acre, five-star resort minutes from the Orlando/Orange County Convention Center was certainly ambitious under any economic conditions. To do it at