Here is another interesting 1!...
https://www.youtube.com/watch?v=-_K3d4-yI14 depending on material you are going to use, I found Home depot has Aztek 4 x 8 x 1/2 " PVC sheets cuts a little easier than wood.. about 2x the price of a good sheet of plywood. I used it for side panels in my Blazer. comes in white ( I Painted these)