Colin,
You are a genius and madman, and we love you for it

It was quite funny as on Christmas eve I was thinking to myself, 'I wonder when someone is going to do a PCB 1073, we've spoken about it for years...', lo and behold, not one but TWO surface, genius!
I love the layout, I noticed some of the smaller details as well, the holes around the 2N3055 heatsink for ventilation, preventing the heat potentially damaging the PCB in years to come. It also looks like there is onboard regulation as well if you decided to use it?
Well done mate, top notch as always!
Cheers
Matt