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My reason for quoting the door weights was to point out that there's not huge scope for weight loss in duplicating them in composite. I make no judgement with respect to the value of doing so.
The foam would be the crushable structure. There are foams available for the purpose, with defined crush rate vs pressure and minimal &/or slow rates of spring back.
On race cars the foams are used inside composite boxes attached to a roll cage and in the head supports around open wheeler cockpits.
I think in some cases which foam is used is determined by the ambient temperature on the day, as the temperature affects the foam properties. (Multiple head supports are made and selected from.)
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