Battery to trunk-would this work?

Going to roll with the diagram in post #8 except for the master switch being located in the rear most part of the car I will install a switch somewhere in cab for more of a security feature. Running 1/0 welding cable for the pos/neg to relays and to the starter. #4 welding cable to alternator. #10 THHN for all control wiring. Thanks for the help all.