I would be really interested if anyone ever attempted to adapt a modern servo electric system to a Skyline, e.g. one of these Bosch units which are found in many modern cars:
http://www.bosch-automotive-steering.com/en/products/car-steering-systems/electric-power-steering-servolectric.html
I like the simplicity of these systems. I would imagine the control/electronics side of things might be the challenge given how different the steering feels on many similar models these days (e.g. different Porsche 911 variants), simply due to software changes.