Didn't that fee allowed to change account names of other users or something like that?

IIRC they were working together at the same time. The "2001" book set action around Saturn's Iapetus moon and so the screen initially was meant to follow it. But since it was impossible to create convincing planetary rings at that time, action switches to Jupiter's Europa. And so all other Odyssey books were set there as well.

Just assume that Ramans were "złote rączki" and everything simply clicks together. I mean, if they were capable to build such ships in the first place, it wouldn't be (and wasn't) a problem to fill these with capable environmental control systems and suitable drive.

In the other books characters are put into hibernation so they could travel at high speeds. Perhaps atmosphere was removed and only minimal breathing mixture was provided for the passengers.

By the way, I think SciFun had an episode on this channel about O'Neill cylinder

So basically Avatar just without all the Smurfs huh?

It would be surely minced thru to fit all the standard of the industry - and that's the fear I'm having while craving for screen adaptations of books today.

Perhaps you mixed plots together. "Rama II" takes on expedition to the second ship which ends with 3 people being trapped inside and put on a journey outside solar system. Then "The Garden of Rama" describes how these three had to adapt to life on the alien ship. There happens the plot where the main character Nicole has 5 kids, 3 girls with one man and 2 boys with another. First part is written as her journal, then book continues normal narration and focuses on second ship reaching the destination and reasons why they were bought there in the first place. Then, plot with return to the solar system happens where other people were boarded in secrecy on third ship. And it at some point revolves around Nicole's daughter who lives a destructive life.

Unlike others in this comments tree, I liked the other books. These go against the typical space exploration journey where you have humans on their ship surrounded by technology they're familiar with and on which they can fully rely. Here, characters are uncertain of their future - they don't know where they're going, have to adapt to the surroundings, discover the unknown and face downsides of human beings. There's none of that familiar splendor of "going boldly where no man has gone before" or heroic actions, great fights in the outer space. Lee's contribution shows us as small, even unsuited to live among others - here and there.

On the other hand, I'm not fond of his other books where he tried to continue this universe: "Bright Messengers" and "Double Full Moon Night". These felt like distilled, fast-tracked version of "Rama" with more religious overtones because of two characters included.

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Clarke's own books and these which he co-wrote with other authors have potential for adaptations for the big and small screen. "Rama" series taken by good writers and directors could become a new hit comparable to "Lost" show - which if you stretch some things, feels somehow similar.