I want to make a headboard that spans the width of my wall - 10 ft. I know sheets come 4 x 8. What would be an easy way to join the two pieces of wood and what kind of wood would you recommend that would keep it relatively light weight? I plan on upholstering the piece with white "leather" and then use upholstery tacks. Additionally, what is the easiest way to hang it on the wall? Thank you! Cynthia