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This is not intended to be a 120 mins. movie, but maybe a nice 30, 40 mins, or less. It depends. Ambition is not a problem, turning it from paper into a movie is the hard part. 
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Look, if you still wish to do this, then go ahead, but in all hoensty, even 20 minutes is too ambitious. People on the forums are not going to sit through a 30 or 40 mintue fan movie, that will look and feel rushed together.
Have you ever made a movie before?
If so have you ever made an animated movie before?
A movie of the scale that you want is going to take several years to be complete. Take my advice and go for the one minute-er. People will appreciate it more. It would be short, sweet and of good quality.