Might wanna find a place to mount a switch, that tells the car when the hood is open or not. So run it like this
Ground wire, just connect to the hood, or near the hinges. Then for the power wire run it near the openind of the hood (near head lights, make a small switch like the ones that are used for the foot well lights that are activated when your doors open. Then from the switch to a fuse, then to the battery. Should work fairly easy. I was thinking about doing this too. Except with Cold Cat Tubes, or LEDs, to shine over the entire engine bay.