You really have to make a desicion on how far you want to take it, i am relocating my fuse box,lighting harness, map sensor, resistor box,main harness connectors, overflow tank, washer fluid tank, battery and tucking all the wire on the motor. Now you dont have to do all this just to clean up the engine bay, you can simply re route alot of wires and cleqan up the bay quickly with no cutting or extending wires. But the more you hide the better it will look.
This would be point a my starting point and what i am working with

ok lets get the motor out of the way

ok now where to start. lets start here and move the battery+tray+ grounds

ok now lets lose the fuse holder/powerwire/headlight wires and relays

ok thats out of the way what now.. ok the fuse box and,mapsensor and wiper wiring

but where is it going to go now? through that big grommet right here

ok now that is where on the inside of the car.. under the factory sound deadener and right above the ecu in a ef


