McG Doing 20,000 Leagues Under the Sea Prequel

When McG is done doing his Terminator sequel Terminator Salvation he will be moving on to doing a prequel to 20,000 Leagues Under The Sea. Scripted by Bill Marsilli, the film is an origin story of Nemo as he creates his warship, the Nautilus.

The original film is of course based off the Jules Verne novel. I actually think this could be a pretty cool film but I have alot of questions on what a prequel could really focus on? The original movie was about a giant monster so whats the focus of the making of the ship in a prequel?