Im not using any relays, battery cable goes from the battery to the switch then the other side of the switch feeds the starter and starter relay and main wire for the bulkhead.
Then your starter cable is hot all the time when the switch is energized.
Not real safe IMO.
Spend a few more bucks and get two relays.
Starter relay, ford type is excellent.
Constant duty relay, the one that SHOULD be controling power on/off to everything.
"kill switch" controls all power leaving the battery area.
no constant hot leads going forward.