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from the rear view, if you can imagine the template being taller in the middle, and lower at the edges - like an ellipse. you have the exact opposite here. you have high pressure in the middle, and low pressure above the fenders. air will be streamlined around the greenhouse. as aerohead said, you'll have vortices off the front fenders, and twin counter-rotating vortices coming off the rear fenders. having a flat trailing edge will kill two vortices.
imo, safety is not an issue here. a racecars' biggest problem is that wings that generate enough downforce at low speeds generate TOO much at high speeds. downforce is not linear with speed...so the car handles differently at different speeds! imo that's more dangerous than a little lift. your rear diffuser goes a long way to kill lift. a front splitter and perhaps a small rear spoiler should be more than enough.
how fast WILL you take this car? downforce at 150 mph is purely academic if you only take it up to 75. the biggest reason oem's look for zero lift at highway speeds is to reduce vortex drag, and boost fuel economy. it is NOT a stability issue at typical speeds. i'm saying that you can style it any way you want without causing problems.
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