[helpermethod]

I just don't see how you can create a full, well designed, functional website based off an original idea in under 10 hours.

There lies you false assumption. The idea is not to ship a fully fledged website after 10h. The idea is to ship a minimal incarnation of you idea, a working something. That something may be full of bugs, ugly as hell and hard to use or install. But the important point is: You have something you can build upon and you receive user feedback right from the start which is invaluable.