As far as contacting the powers that be at fox, well, I've been trying (on my own) for months to get ahold of someone, or at least get a response. I’m sure you know that Hollywood, at the end of the day, is looking to make money, so you may end up having to use a ‘middle- man service’ (these too are part of Hollywood) to pitch your idea to 20th Century Fox. I’ve decided to use one of these “middle-man services” myself via what's called a 'copyright clearance service'. I’m not sure what type of service you’ll need in order to successfully submit your idea. FOX producers see thousands of move idea scripts per year, and a great deal of them get rejected.
If possible, I would contact the Thomas Brothers, to see how they went about submitting their idea
( screenplay) to FOX. ‘Predator’ was their very FIRST screen play, and they hit a home run with it!