Here: https://archive.org/details/HitchhikersGuideRadioShowLive
I believe the actual show starts from the 7th file in the list (the first ones are interviews and other such things that happened later)
Edit: The radio show is how it all started AFAIK.
Edit 2: please keep in mind that the content of the radio show isn’t exactly the same as the book.
I do think that cargo ships are the one vehicle where solar panels would make sense though. Add that and a sail, and you should be able to increase the range considerably.
Yeah, I don’t understand the “to play in 2025” part of the title. I’ve already played most of the games in this list.