A group seeking to establish a 600-seat performing arts center in the Gorge continues to work toward its goal, including identifying a site to build on.  Mark Steighner of the Performing Arts Initiative says a final feasibility study should be ready in about a week, but it shows 70 percent of the operating costs could be covered by ticket sales.  He also says they are negotiating to lease three parcels of land on Westcliff Drive to locate the facility.  The group has established its non-profit status.  Steighner says their next step is to hire a project manager and a capital campaign planner.  The project does have a website:  gorgeperformingarts.org.