I have driven it in near 100 degree weather no problems. Air is directed right to the radiator, which is on the left side of the car.
As to boxing in the rockers, make sure and add strucure back in. They are made up of three layers. The blue donor car almost broke in half when the roof was cut off. My car had all three layers welded back in before boxing them in.
Or maybe you could weld in boxed steel say 2x4"
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