Depends just HOW complex you want to make things!
This is the fuse box i've built for the Dolomega, it's a 16 fuse box from car builder solutions. only 14 are currently in use leaving room for later expansion if needed, there is also a secondary board on the n/s flitch with 6 fuses for headlights, spotlights and horn. As well as a grand total of 11 relays around the car.
The 14 fuses in the main board cover separate fuses for instruments, reverse lights, wash/wipe, brake lights, indicators, heater fan, HRW, fuel pump, stereo, faglighter, electric windows, central locking, clock/hazard/interior lights and sidelights.
All this re-engineering has come at at a cost, namely an almost complete rebuild and re-orientation of the main loom to make everything work correctly! Some may think it's overkill, but I have had to do so much wiring to make the engine and transmission management work, I thought it best to update the car's systems to modern standards as well!
Steve