Gainesville recreation officials are ready to start developing their idea for a “regional” park complex. They have appropriated $450,000 for design work on the complex that they said will be a long-term, multiyear project. Melvin Cooper, director of recreation, and Michael Graham, deputy director, made a presentation Tuesday to the Hall County special purpose local option sales tax citizens review committee — a group formed after complaints about how previous revenues were spent on infrastructure projects.