As well there had been considerable hacking by previous owners.
So I decided to put all new wires and a modern fusebox unit. After some research I found that the 9+3 kit from Rebel wire would be a good compromise of price and quality.
Ordered mine from here in the UK, these guys were really nice.
It took me a while to understand how it works but once you understand the concept you're good to go.
It is nice because the kit comes with high quality wires that are heat resistant, much better quality than the originals and will for sure last my lifetime. Had to call tech support to understand how to adapt for Europe and support was really friendly and helpful.
See below a lot of the wire laid out ready to go to the engine bay and lights.
I wanted the fuses to be inside to keep an original look, so I mounted them on a hinged bracket that I made with a screw on lock (a bolt with a bar welded on).
It looks like this when you remove the screw lock, easily accessible.
Now, onto wiring and soldering !