need help
 

Just bought a 88 Ford f150 lariat xlt extended cab want to make a box in the back but still want to have seat for lil trips when i have the kiddos have seen some flat 12" woofers that IM intrested in installing as well ..... Also Need to know what would be the best wood to use not a rookie installer but I am a rookie box builder need any help possible....... Thx

I built a fiberglass molded bottom pan with an MDF front and top for my Dakota.
It was quite a project but I could still use 60% of my 60/40 rear bench.