I haven't test fit it yet, but my hope was to build a bracket to hold a small powered sub under the luggage shelf, in the space where the first aid kit belongs. The other thought would be to relocate the vacuum reservoir and fit one there.
The other thought was to build a subwoofer enclosure using a vintage suitcase, and store it in one of the rear wheel arches. Not expecting that to sound great, but it would at least look reasonably period-correct.
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