if you dig deep on this site you will find examples of written applications and video submissions that were successful. That should give you an idea, just an idea mind you of what YC is looking for. While it seems you're coming up with a multitude of ideas for your project I will concentrate on producing some limited scope of what you have to show. This is not a Hollywood edition so razzle dazzle will not get you far. Substance is the key. If your idea was well articulated and got your point across, PG and the rest of the team will be able to evaluate application properly. You have until October 10, so look over your application and be concise and direct. if you've already accomplished that way and hope for the best, if not edit your application and resubmit. Good luck excavation!