Today I got my electric power-assisted steering column in the mail. It came out of a 2006 Vauxhall Corsa C, and I got it on ebay.co.uk for 58GBP shipped. These columns are commonly adapted for use in rally cars and custom cars, and provide a great way to have power steering without the requirement of a hydraulic pump and lines cluttering up the engine compartment. The column has a built in controller to adjust the amount of power assist based on vehicle speed and steering wheel torque input. There is a great write-up of what is required in order to retrofit one of these in a car over at Seventh Heaven.
After checking it out, I made a part model of it in CAD that contains the important geometry I will need in order to design the mounting points for it.