He Maroen!
Nice one!!!
We used MDF 10mm, outside box measures 120x80x80 cm, inside box 110x70x70. Big enough to house a 1x12 cab, probably a 2x12 as well.
It weighs about a ton, I wouldn't want to move it (too often), but hey if it's heavy it'll stop sound, and that's what it does!
I designed this box for Maroen after testing the smaller version myself. More info>
DogHouse on BAM