well I plugged everything in, and powered it up.
No smoke ! - Result :-)

The dual z motors work - steps are clearly off, but they both turn together :-)

That said all the axis appear to be reversed.
Endstops don't appear to have registered and axis home in the opposite direction to the stops.
Hmmm.

But the screen works.
And nothing explided or caught fire.
So I think it's mostly a case of working through the configuration file and seeing what's what :-)