They answered all of my questions, and it's only been a couple of hours.
1. Yes you can include additional views (front and rear) on extra template sheets.
2. If you have a clay model or fiberglass model you may include photos of it.
3. Be sure to put your contact information on every sheet.
They seem to be very flexible, in the FAQ section they said you could even exclude views (one gesture sketch could win?).
Link:
Factory Five Sportscar Design Contest - Frequently Asked Questions: Grassroots Motorsports Magazine