Mumbai -- National Award winning director Priyadarshan, who has been planning to make a film based on AIDS since 2009, says he wants to cast superstar Aamir Khan in the movie. "The project on AIDS is on, but the script is not yet ready... (I had) too many schedules and things to do so couldn't finish the script. I had discussed it with Aamir earlier and that time he wanted to do the film," the director told PTI. I will complete the script first and approach him (Aamir) again. If he has time he will do it," he added. It is believed that the 55-year-old filmmaker would start working on the untitled AIDS film after wrapping up his current project, Kamaal Dhamaal Malamaal.