Yeh you can do the dodgy and just tuck the wires under the trim.


yeh you feed the wire in then you should feel a lump under the black stuff under your carpet, you know that underlay stuff in your pic



reach your hand up under the black stuff then pull the wire through


depends on how the terminals are, if they are like these i would put a ring terminal on the end



or if like these just strip the end of the wire and put it in



yeh i used that back seat bolt when i had 1 amp, bolt wasnt long enough for 2 ring terminals + seat bracket so i drilled a new ground point in the boot after i upgraded. remember to sand off the paint where your ground is on the chassis.