All done!
Gave the corners a final paint early this morning so I could fit them this afternoon, drilled out the speaker mounting holes, re-dyed the baffle, fitted more wadding inside so that more or less all internal surfaces are covered, cleaned the jack sockets and replaced the wiring, mounted the speaker, and put the grill back on. Finished.
I've given it a blast as loud as I dare at home, and the house was rattling. It does sound better than it did, in fact it sounds bloody marvelous with the Bassman. Perhaps it's just me making sure everything was tight and secure, extra internal wadding and the speaker mounted properly, but it's tighter sounding, no rattles and no flub. My intention was to create a recording setup, but I think I could gig this rig!
Very happy with this!
Cheers,
Rob