The heat soak on my clapped out 3.5 used to reach 106 degrees on the mechanical VDO gauge after a drive, so not sure of how much of a drama it really is, but I think vents are a good idea in the bonnet - there is no room for the hot air to escape under there.
I've seen some D3/4 vents cut into the side of the bonnet and they look quite good. The RH one is easy to get as people pull them out to fit snorkels but the other side can be harder (and more expensive...)


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