You could take off the sill trim ,run the wire through there then behind the door seal through a gap at the back of the wing and through a factory hole in the inner wing to your battery. This is what I did with my mk1 Dispatch. As for the quick release clamps just put a crimp on o ring connection at the end of the cable and attach it to the existing bolt on the clamp. My mk2 Dispatch has these and that is what I did. The + clamp has a small nut and bolt attached to it, I just coupled it to that as in pic. The red/white cable goes to ignition live, as I just use a standard 30a 4 pin relay.