I had the nokia kit, but changed to a parrott one as it had a screen, the parrot runs in line with your stereo harness and works thru the car speakers, as for the mic, i ran it up the side of the screen and along the headlining, removed the interior light and put the mic behind one of the slotted panels there.
As for the box of tricks, wrap it is foam or cloth so it don't rattle and there is pleanty of room under the steering column