Found this pic of the Mclaren P1 radiator/internals. Notice the awesome angle that Mclaren puts the radiator at, just like what Figure 'C' of the image Gasoline Fumes posted!!!
Also notice the "LTR Ducts" that Mclaren added to just in front of the wheels just before production?! Apparently they aid in cooling and extra down force.
P.S. Liking where this thread is going, wasn't sure where it was headed in the beginning, but now it's making me want to cut up my hood and put a big gaping hole in it!