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Don't forget to insulate the lines. I know how bad anything "cool" sweats in my car, I imagine with cold lines, you would have lots of water pooling. They make shirts like what you are describing for race car drivers and astronauts, the protective gear they have on the outside is actually a good thing, because it keeps the cold water lines from condensing. At the minimum, I would try to figure out a way to have some insulation between the cooling lines and the seat, you at least want the cooling effect to be directed toward you, right? A material I would recommend is wetsuit material. I got a seat cover made out of it when my seats started to rip, and it's great. If I spill water, I just open the door, and wipe it out. Maybe you could find a way to use foam to make a molded back support, and put the cooling lines on the driver's side, and cover with wetsuit material.
One of the biggest helps I have found is the beaded seat cover. Not perfect, doesn't prevent me from sweating, but does help airflow to my back and under my legs.
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