Quick update - boards arrived, they look good.

I'm starting assembly with just the bare bones - 2 bus switches, enough to select between two inputs. And leaving off all the "just in case" resistors (I'll add them in when things inevitably start acting crazy).

One small problem I found tonight - I selected the wrong package for the shift register. Did I make the mistake when ordering, or when laying out? ... one for the philosophers perhaps.

Getting the hang of my dirt cheap "Bakon" soldering iron with it's knife tip that is poorly tinned...

Will hopefully find a local supplier for the shift register tomorrow.