I used 4 48x36 pallets and found one that was custom made to be 13 feet long without any boards on the base. The custom made pallet worked great for the back. I did not secure the bottom pallets but I did use L brackets to secure the back to the base. A few screws to secure the short side and the armrest and it was done. A little sanding and some stain/paint and it was done in 4 hours.
Cool
Wao.bello