I think if it should be made by an American, I would pick Damien Chazelle as he would probably do a great job doing more down-to-earth dramas while giving them epic scopes and scales while adding some dashes of humour. Martin Scorsese can make the biopic his modern epic magnum opus but he may not live to finish the film if it would take nearly a decade to make it. As for Asian directors, I would pick Bong Joon Ho as he would bring a sense of dark comedy in this film while being an arthouse film. Or Hideaki Anno can make it a bleak deconstruction of "inspirationally disabled" films like Forrest Gump or Rain Man with a hint of dark comedy. I love Wong Kar Wai's films but he infamously does not stick to scripts and prefers making everything on the fly. My idea for the film is that it would be produced as one 36-hour-long film that would be divided into nine films that are 4-hours each with each film being released every year for nine years.