I am wanting to make a cake that looks like the box for a wine bottle and has a wine bottle in it. I was going to use shaved white chocolate for the filling around the bottle and attempt a wood grain on the box. I thought I could use my 6 in round cake pans and then cut them in half. I need to feed about 40 people and I'm having a hard time figuring out what my cake dimensions should be for that amount of servings. Any help would be greatly appreciated!!!

I have a tutorial on my blog on making a wine bottle in a crate box but it was a 14"x6" and fed about 28. You could always make the box wider/larger to get more servings.

http://sugarsweetcakesandtreats.blogspot.com/2010/04/wine-bottle-in-crate-cake.html

great tutorial. I would use confectioners glaze rather than piping gel but thanks for sharing

There's also instructions in The Confetti Cakes Cookbook by Elisa Strauss. Page 203.