This part of my project should be coming up soon. Been thinking about how to go about it. Can get complicated quickly.
Battery in trunk
FAST XFI 2.0
MSD crank trigger / 6AL
RFID push button start
Fuel pump controller
A1000 in tank pump
Aftermarket AC system
Cruise control
Mercedes fan and controller
Oil cooler fan
GPS speedometer drive
Its a lot to think about, but if you spend a lot of time planning it works out pretty well. Making the wiring diagrams helps out a lot. If you want to see some of my Sheets layouts that document everything I can send them to you for reference.