Now who has been a busy bee then?

Fairly tall and upright looking and based on the size of the cut speaker hole the dimensions look to be about 600mm x 600mm x 300mm? Are you going to put any sound insulation stuff inside?

I did this sort of thing with making stereo speakers when I was a teenager and the sound insulation stuff was just like a thin fibreglass insulation batt. It made a little bit of difference but I was itchy for days after installing the stuff and reckon high density foam would be the better way to go nowadays. There is probably some science on it to be found on the internet but it will need something to stop the timber vibrations resonating out of control.