Now I don't want to sound like a killjoy, but have you guys really thought this 'No Fuses' thing through?
Two things...
Unless you're using suitably sized cable then you're wires gonna get toasty when you have to crank the engine for longer than usual ( when it's cold etc )
But the main thing is lack of fuses. Have any of you considered the consequences of this? I'm guessing not. Say that grommet ( I'm assuming you've at least used one of those ) through the bulkhead pops out or perishes. You now have the bulkhead slowly grinding it's way through the soft plastic layer around that live copper. Once the wire eventually touches the firewall the spark welds the two together. Which just leaves the battery shorted through the bodywork. Now that live wire running under the carpet, right under your passengers feet, is turning into a nice electric heater, which is more than likely to set fire to anything combustible in the area IE your carpet. Before you know it you're stood at the side of the road watching that shiny cupra of yours now turned into a bonfire to be proud of.
If you're lucky nobody has got hurt as you'd have time to stop and get out. But well... your friendly insurance assessor chuckles as he writes his report, knowing his bonus for finding a reason not to pay out is safe.
Food for thought, I know you'll all pounce and ignore me but thought I'd add my 2p worth.
Pete