It can be done and has been many times. Like neverending said, you'll need to take character count, budget and locations in to account. Keep it simple. Focus on a cool story, don't worry about character arcs and such. Unless you are a After Effects wiz, forget about any special FX.
I have dozens of short scripts available if you are looking for one. (Mostly horror and crime, a handful of comedy.) Shoot me an email at
[email protected] and let me know if you are interested. I'll let you shoot a 5 page script free of charge as long as I receive full writing credit and a copy of the DVD once it's finished.