id just take the bumper and latch of... i bet ya its alot eaiser than it looks, esp compared to all the work u did to build the box... plus, it will be theft-proof then
i HAD to drop kick my box for 3 hours straight and we had to cut a groove where the latch was and still had to kick it it wasnt coming out so yea and we sprayed rain-x on the corners to soften it up the box was really good then by time i got it in it was junky sigh