Do it, man!  I'm happy to bounce ideas with, if you want.  You know, this is why I take notes as I watch the flick, track what I'm reacting to, add notes about interesting characters and so on... it's my way of writing for the trashcan, getting creative exercise.  Something I really try to do if I can is fill the holes in one bad movie with elements from another bad movie (this is why I separate my notes into pieces, so I can find them easily and shuffle them around).

W/ Sucker Punch, what are you planning?  Just a better version of the flick?  Or maybe cutting it up and exploring the pieces?  Like try to figure out what the "full movie" would be if it was just the asylum, or the brothel, or World War One Thousand, or Machine Guns And Dragons, or Crazy Train... explore and expand those worlds, and maybe come up with concepts or perspectives that could inspire another project down the road.