There is life after ''Project Greenlight,'' and ''Stolen Summer'' writer-director Pete Jones is living proof. Actually, he's filming proof: The harried auteur of the HBO talent search's first season is hard at work on an $800,000 indie comedy called ''Doubting Riley,'' about a straight-acting gay Chicagoan whose dubious sibs won't believe that he bats for the other team. ''I hope it's a comedy,'' Jones says meekly. Aiming for an Oct. 3 Sundance submission deadline, he'll begin shooting Aug. 18 with a cast of Windy City locals -- except for two name actors he's wooing for the lead roles (and declines to identify). Jones turned down some attractive offers for behind-the-scenes coverage of ''Riley.'' ''I loved my 'Greenlight' experience, but this time I'd like to make a film without anybody watching. I imagine that doesn't seem too crazy.''