i build my own cab, too. it has the large mesa boogie dimensions, and it has two vertical chambers. there are celestion g12-80 speakers installed. i dont have the chrome corners and handle yet, but the holes for the handles are routed. i'm really satisfied with the sound. aah, one chamber ist 1/4 open. can run it mono and stereo. here's a picture.
wow, theres a lot of dust in the pic. gotta clean up.