Painless wire harness install (MORE PROGRESS)

if i were to use that 4 post kill switch could i just use that to kill the power coming from the battery to the starter post? then the 8ga wire that i have feeding power to my junction box under the dash that feeds my fuse box and msd ignition. I have my alternator charge wire going straight to the starter stud.

with my alternator feeding power only to the starter post if i were to kill the link to the battery then it would kill all power from the trunk forward.