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The hydraulic bit is the easy bit, IMO. The hydraulic system does the brakes, power steering and brakes. The hydraulic pump is a low pressure pump (connecting pipes to the accumulator and from the reservoir are rubber) and just builds pressure in the system There is an accumulator sphere controls the fluid pressure in the pressurised bit. From there on the system is quite high pressure and connected by steel pipes to suspension . Alot of the time the pump is just recirculating back to the reservoir. The accumulator sphere clicks open and closed once every 30 odd seconds when the engine is at tick over at higher revs the click doesn't happen as the accumulator valve never fully opens. So a motor wouldn't need current or torque to keep the hydraulics working. But no regenerative braking tho.
lynx-
Hmmm, seriously. One day...
There is a group near where I live that has experience doing projects like this (minus the oleopneumatics!) Would need a solid base car, problem is that even a rolling shell is worth decent money now.
I'd have to paint the thing a real metallic electric blue with white roof and a blue velour interior though.
TRA
I've always wanted to engineer an electric ds.... Have to figure out the hydraulic system. I'd imagine the pumps would draw a lot of current.