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The front track is touch under 52" and the rear track a bit less than 45".
Any suspension that exerts torque on the attachment points to the chassis probably won't work with the fiberglass composite sandwich chassis. I really like the "cradling" that the 2CV suspension, and that is what I need to do with whatever suspension I end up with in CarBEN EV5.
The Porsche 914 rear suspension could be mounted inside of a metal box inside of the wheel wells, and a box beam (located at the centerline of the rear wheels) could connect the two boxes and form a cradle frame across the back of the chassis. The three faces of the box (front, top, and back) will spread the weight and torque from the rear wheels over a fairly large area.
The front suspension has to also "cradle" the chassis, and the subframe needs to "absorb" any torque from the 'A' arms and the spring/dampers need to bear against each other.
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