hey i read mandos' walkthrough but i couldnt figure out how to run my signal to the back of the HU. i know how to get it to the door sill panel but how do i get from there to the back of the HU? there's a jungle of obstacles behind the glove box and then a huge white solid frame. i dunno where to thread my signal wire to get to the HU. Also, i have High level input wires that i need to splice to the rear speaker wires on the HU. are the rear speaker wires on the back of the HU already accessible for connecting or will i need to cut them to attach my signal? thanks a lot