standalone chassis wiring

[Enjin]

so as I'm going through all of these wires, relays and fuses, deleting the unneeded, I wonder to myself... what is keeping me from just taking out the entire upper harness and wiring it directly into the ignition/accessory/positive terminal and running it through a series of switches?

the only thing that is keeping me from doing this is the timing relay, the thing that controls the intervals at which the wiper wipes and the turn signals.

everything else can be run through a switch... and that is not even that much:

lights, blower motor, fan, radio, fuel pump, blinkers. the brake light relay can be run through the switch to short out if not engaged... any thoughts?

I feel as if this could simplify the entire system after deleting so many things.