Below some solutions, experiences, etc that may be useful for others. Comments welcome!
Click on photos to enlarge, right click to download.

Barber  haulers for code and downwind sails
Use existing spinnaker boom downhaul (black line on photos) or a dedicated line (if downhaul is already used for the spin boom). Connect with soft shackle to the double ended (grey) dyneema on deck which goes to snatch blocks on each side of the boat.
See them used in our Youtube video.

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Jib inhaulers
By adding inhaulers the jib can be trimmed for better upwind performance and sailing closer to the wind.
This solution should be possible to implement on most other boats so welcome to copy!
Photos of v1.0 below. Still some ideas for improvements...

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Fuel volume/gauge measurement
Pump out fuel via the engine fuel hose connection. Fill up in order to see how real volume corresponds to the gauge. Tank capacity 250 liters according to Xc 42 specification. Max 200 liters can be used in reality...

Cockpit net to keep birds out
Also birds like our cockpit behind the window/sprayhood, sitting on the table and steering wheels and shitting big loads.
We solved it with this net.