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The already quoted e-fans can be sourced at junkyards for cheap. The ones out of a Ford Taurus or a Chevrolet Lumina APV with dual-zone A/C provide enought cooling.
Another thing I'd consider is a full under-body pan which can be made out of marine-rated plywood, also used in many race cars, including rally cars.
You might know some truck engines from Cummins and Detroit Diesel have fiberglass valve covers and oil pans. I wouldn't disconsider to make at least an oil pan out of fiberglass for weight-saving reasons, but would coat its internal face with silicone (that liquid one used to make gaskets and seal leaks) due to its higher resistence to high temperatures. There were even some racing Porsches fitted with oil pans made entirely out of silicone, but it seems too soft for a road vehicle.
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