Hi MJ,
I drilled a good size hole, but just big enough for the fitting for the rigging hose. I looked at your picture for quite some time as we were in the process of installing the hose, but couldn't make out what you had done. Did you actually cut a hole in your rigging hose out of which you then ran the oil, gas, and steering. In other words, do all of your wires and hoses run together until exiting the transom area at which point the oil, gas, and steering cable separate through a hole in the rigging hose?
Thanks again for making your picture available.