I'm trying to get some ideas. I've got an '87 K5 DD and use it as a pickup a lot already (only been DDing it for a month). I often fold the rear seat down and roll it forward to haul crap, so my room for a toolbox is limited. I either need something that isn't too tall, or something that is narrow and tucks over to the side. I've considered the side mount boxes at sears with the 5 pullout drawers. Anyway, post a pic of what you did and all, and maybe it'll help some folks.