If you follow the bonnet pull cable it goes into an elongated hole quite high up the passenger footwell. It goes through a rubber grommet which is enorous compared to the cable, however you will not get any thing like amp cable to go through the grommet. But dont dispare because if you pull out the grommet the hole it leaves behind is large enough for at least an 80amp cable. Dont worry about water getting in either, as so far mine has been dry. Dont forget to insulate the cable against rubbing....you dont want to start a fire!!!
Unclip the power steering reservoir and the pipes a bit further down and move it out the way so as you have more room to manouvre, pull the carpeting away from the bulkhead so you can get your hand down behind it and get a mate to pass the wire from inside the car and you should eventually feel it after a bit of wiggling. I have got the bonnet pull cable, 80Amp cable, alarm cable, 20Amp cable for head unit all going through this hole with plenty of room for some more.
Oh and you will lose a bit of skin!!!
Good luck!!!