Bulkhead Delete

Has anyone actually deleted the bulkhead fitting in a bid to tidy the engine bay wiring...Im looking at a full clean up in there, and am not sure If I should pull the plug and mount it somehow inside the firewall, or cut it off and solder wires on and direct them to their respective destinations...Im going to run a multi strand cable though the drivers side wheel arch for the front lights , horn etc
Has anyone done this? Any advice or concerns I should worry about?