While I appreciate the input, my op questioned the use of a chest carry holster rig. My thinking on this is icoe, presentation of a pistol from this carry mode would be unexpected and somewhat easier than other options. Off body isn't an option. Also, although I doubt I would ever get into a running gun battle, I could, if necessary hit the cruise control and make a draw or my wife could reach around and draw. Lots of "what if's here.
Richard