P.S. This is my first instructable!!!
Step 1: Gather tools and materials
hot glue gun
mod podge (a type of glue mostly used for collages) i found some at walmart
styrofoam (either contractor boards or great stuff)
I was able to find most of these supplies at a new home build up the street. Contractors throw away EVERYTHING.
Step 2: Cut all of your boards before building
Two 15 inch X 41 1/2 inch boards
Two 3 inch X 40 1/2 inch boards
Two 3 inch X 15 inch boards
Two 1 inch X 40 1/2 inch boards
And Two 1 inch X 15 inch boards
Your measurements may be different depending on your guitar. Try to have no more than a half inch extra on all sides. Be sure to take into acount the thickness of your wood. the thicker your wood the easier to work with and the stronger it will be. The thinner the lighter and easier to carry it will be.