Adapting a book into a movie.

I think if Hitchiker's Guide to the Galaxy(HGTTG) were to be turned into a movie (Which they have, but igonre that thought at this point) it would be very diffcult to get the settings right since they are going though space and completely different planets. It would be hard to get the two rising suns on the surface of Magrathea. Even space itself would be hard, we don't know much of what it looks like for real. You would have to show not much of them traveling and if so just show them in the ship traveling. Also you would have to change how they came into Margrathea.
Three things they would have to keep that would be essential to the story would be:
1. Ford and Arthur would have to end up on the Vogons ship and get caught. It is a huge part of how they end up on the Heart of Gold.
2. Deep Thought. They would have to keep Deep Thought has started Earth. (Basically. Read the book, you won't get it unless you read it.)
3. The Guide itself. I know this sounds werid(you know since that what the book is called) but they need to keep the explinations of different planets and things. Also the guide is the whole reason why Ford is on Earth, and he saves Arthur and then they have this epic adventure.

Three parts that would need to be cut for the movie would be:
1. Zaphod going traveling to Damogran. It's point of seeing him travel on water and seeing a welcoming party.
2. The Magrathians(No idea how to spell that) background. I wouldn't need to know that they have been asleep for 5 million years to understand what is going on. It was basically a filler to me.
3. Trillian and Arthur's past. It doesn't add to the story that much (in the movie it does). Trillian harldy shows that their past history means anything. Also its only a big deal is that Trillian and Arthur are the last humans alive. It wouldn't matter if they have a past to be truthful.