If done right, you will be a god however if done the wrong your career IS OVER and everyone will HATE YOU.
40 minutes? Goodluck with that I hope you pull this off because I dont think its possible for some1 to make a 30minute+ movie in GTA and make it good. I know this one dude who made a 1 hour san andreas movie. It was complete shit because he used TEXT instead of VOICE OVER.
Max Payne is right. PC version will be alot easier