i built one out of plywood, was only about 1/2 the width of cab so passenger side jump seat was still useable (and more importantly, passenger front seat could recline fully for when i was somewhere and needed a nap) had pictures on photobucket but of course thanks to them they are unveiwable. mine had a top lid that hinged backwards and i did have a lock on it. i had about everything in it, tools, floor jack, tow strap, even the crap youd normally keep in the glovebox. id even put my wallet back there so i wasnt sitting on it during long trips. i get another supercab it will be going back in. right now im in a reg cab longbed and theres not room for much more than a extra lacket behind the seats, be pointless to try and build a box for it.