Order a box the depth u want offline. Can get them as cheap as 16$. Position that box where u want it, trace with a sharpie. Very carefully use a cut offwheel and cut out the traced box. Cut to the inside of the line a 8th to 16th inch. This will allow you to test fit the box and trim and test fit. So its nice and tight with no gaps. Position to box at the depth u want run a marker around the box and cut the excess off. Reinsert and weld it in. Complete body work as needed.
2011 Ford Ranger XLT 2wd Supercab
Tinted, Black head lights and corners, Smoked Tails, Kenwood Double Din, 2x 10 Powerbass M10s, 1800watt DB Drive mono block, 6000k HIDs in headlamps and fogs.