As impressive as the detail in his plan might seem, it's just too implausible to pull off anything more than maybe 45 minutes of footage, considering location and actor payments as well. I would recommend they try to pull off a Saw-type film, minimalistic and driven by characters and whatever the plot/setting might be. Maybe they could go into the woods and make a film about someone slowly going mad or some shit, I dunno, preferably something that wouldn't require much outside of the camera, the lead actress and relatively basic props. This way, they could both pull it off within a month and have it bumped up to a more proper run-time.
Seriously though, the best I've done was a one-and-a-half minute long video of myself eating cereal for college. It was cut and edited in a way that I'm told made it funny/suspenseful, but, like, a minute and a half.
This is your first film and you want a fuckin' 90 minute affair? Dude, man, good luck.