I found an issue where the wiring diagram I have been using showed completely different wiring for the instruments. This took a bit of thinking before I could move forward.
So, after a day of hard work the connections in the headlamp shell are almost complete.
I just have to connect the wires for the bulbs.
Next job will be connecting the horns, coils and tail lights.
Then (I think) I can start preparing te engine for starting. I have to fit clutch, brake and carburettor cables, fill the engine with oil and connect the neutral light switch.