I started with the motor bogie.  It's a fold up design in nickel silver.

Getting it square was a little tricky.  Especially with the brass bearings which are very deep. Accentuating any misalignment. 

I have fitted a North Yard two stage gearbox.  This uses a neoprene coupling to connect to a D13 open frame motor.

I had to reverse the motor bracket to make some space for the coupling.  The motor will encroach into the luggage space.  I can live with that and will camouflage it somehow.

Sorry, I am struggling to re-orient the pictures below. 

Valve gear next, which will be a challenge - it's is SO small!