Developers are ready to provide a peek Monday at the new Hollywood Casino Columbus, which will offer gambling in the state capital as the third and largest of four casinos approved by voters. The $400 million project is scheduled to open in early October. Organizers say the carpet is installed in some areas and a few of the 3,000 slot machines are in place, but other areas are still largely under construction. They have started hiring about 2,000 employees for the 475,000-square-foot facility, which includes several restaurants and spaces for hosting events. It will offer 70 games, including 30 live poker tables, blackjack and roulette. Developers estimate the casino will draw 3 million visitors a year.