Flembo

Hi all ,completely new to all of this, I need some assistance if possible. I have been given a Mercedes engine/autobox and rear diff. It was going to be scrapped so I thought Trike. The y have also given me the complete wiring loom ecu' s as well. Is there anywhere on the web that I could source a complete wiring diagram that would include the ecu's. I obversely do not need all of the wires like the air bags and the electric windows but it is a nightmare trying to sort out. My way of thinking is if i do away with the electric windows wires would that then affect the immobiliser as it would think that the car was being broken into doing away with the air bag wires the car may think that it has been activated ?
thank you in advance
Mark

PS
Forgot to say it is a
Mercedes-Benz C-Class (W203)