AI am making a car cake for my father-in-law's 75th birthday party, expecting about 40 guests. Two questions:

1) Have you ever used The-Blueprints.com? Is the website legitimate? I can't find too much info on it.

2) What size sheet cakes would you start out with for a car cake that needs to feed 40 people? I feel like I ALWAYS overshoot.

Thank you in advance, Allie