I agree that this could work as a short story of about 30 minutes. LooneyTunian, are you open to the suggestion of at least starting it out as a 30 min. short, and then expanding it later when you get the feel of it?
Not sure if I understand you guys. First you say he's got to do this himself, and now you are trying to convince him that Carrey shouldn't have the role he originally intended. Let him figure things out for himself.
:^: FTR, the OP asked for our opinions, feedback and suggestions, which is what we're giving him. No one is trying to convince anyone of anything; just offering advice on what we think would be best for his story idea. Whether the OP chooses to go with any of our suggestions is entirely up to him; he doesn't have to and he's sure not being forced to. In the end, it's LooneyTunian's idea and he should take his idea in whatever direction he wants it to go.
And by no means is anyone else intending or trying to do his work for him. He does indeed have to do it himself. But you must take into account that this is the third thread like this that LooneyTunian has created, and so far he hasn't produced a lick of physical work to show for it. He seems to believe that everything has to absolutely perfect before he can actually begin writing so much as a rough draft, so hopefully our feedback will help speed that process along.