Hi Reuben,
Yes, the diagram shows the fusebox inverted but the actual numbers should be correct - just printed the other way up. - At least mine were - see picture.
The other discrepancy is in the wiring of the windscreen wipers. The diagram shows only two wires as for a non-parking wiper but the cars were fitted with self parking wipers that need three connections. The correct connections and colours are:
No.1 on the motor = Black/green (62) to the wiper switch
No.2 on the motor = Green (17) from the fuse unit
E on the motor Black (57) to ground.
The second connection on the wiper switch has to be Black (57) to ground.
As far as I remember the only other head scratching I had to do was to sort out how to wire up the DB10 relay for separate indicators.
Since I have a period +ve earth radio and +ve earth electronic conversion on my SU fuel pump and ignition circuit (Pertronix), I elected to stick with that arrangement and keep the dynamo.
No problems so far, but I don't do much night driving.
Andy