I made a guitar cake from a 9x11 2-layer cake (carved) and a 1 layer 8in square cut up and made into an double layer 8x3in strip with the extra cut off used for the bit where the strings are tied (don't know what it's called!), and that easily served 30-40, so I wouldn't worry about it!
That is a BEAUTIFUL guitar cake!
I like the idea of using a 8" for the neck. That'd be less trouble than using the mini loaf pans I was thinking of using. How big was the end product? I'm wondering what size board I'll need to use.
Thanks for the help, gals!
A 9x13 uses 1 1/2 mixes which should give you 20 servings; add some mini loaves and you should be in business
The cake was laid diagonally on a 20in square board (so it was longer than 20in), and it only just fit, so I would put it diagonally on a board maybe 22-24ins square. Hope that helps!