I placed my order without a signed offer sheet. We agreed to a price, he ran a tape on a calculator and initialled it and initialled my calculation sheet with the words "final drive away price". I was a little concerned that this is all I had, but he did give me the production number, and a copy of the order form (which includes my name), so I'm comfortable that it is my car.
I'd say, at the very least, make sure you get the production number and make sure they've ordered what you want. If you haven't ordered Titanium Silver or Black (the most common colors) and have an odd mix of options, you can be comfortable that the car wouldn't be an easy sell for them if they don't honor your deal.
Also, call the dealer a lot about status and you'll get more comfortable that they'll honor the deal.
I'd say, at the very least, make sure you get the production number and make sure they've ordered what you want. If you haven't ordered Titanium Silver or Black (the most common colors) and have an odd mix of options, you can be comfortable that the car wouldn't be an easy sell for them if they don't honor your deal.
Also, call the dealer a lot about status and you'll get more comfortable that they'll honor the deal.