Connecting the parking brake cables to the 2005-2014 rear discs used in my GT2008-RSM and GT2008-RLG kits is very simple to accomplish.  The brake calipers must be mounted as shown aft of the axle.  Just weld a receptacle for the cable housing end onto the outer u-bolt, then crimp the end of the lever so it forms a tighter connection on the caliper parking brake lever.  I used a large hex nut and ground the exterior of it smooth after welding.  In order to remove the outer u-bolt without having to remove the shock and shock plate, place a large c-clamp in front of the axle, clamping the shock plate to the spring.  That will hold everything in position while you remove the u-bolt, weld on the receptacle, then replace it.  Make sure the tube is welded on so it points straight at the connection on the caliper lever.

This allows use of the stock drum brake cables in their stock configuration.  A minimum of 1" cable travel is required to set the parking brakes.  Be sure to adjust the cable tension as tight as possible without unseating the levers on the calipers.  Actuate a few times, then readjust to be sure everything is seated and as tight as possible without beginning actuation of the parking brakes.