Rough dimensions as I can get them, box is wet right now.
Sides 6mm, bottom 9mm, lid something around 11 12 or 13 mm.
Base of box is:
width; 31 1/2″ at front, 34 at back
depth; 22″ at sides, 25 1/2 at middle
Top of of box is:
width; 30 1/2″ at front, 33 at back
depth; 22″ at sides, 23 at middle
height 19 1/4″
Cheers