Cake Inquiry

Hello,

I'm interested in getting a quote for a groom's cake for my rehearsal dinner which will be the week of August 1, 2010 (plenty of time?)... so figure to feed approx 30 ppl, and I want it to be a recreation of his Mustang car with the 'just married' cans and bells and things hanging off the back and my veil out the passenger window. Any ideas on what this might cost me and when I should book it??

Thanks in advance!

- Dana