Space elevators are fine, but they're supposed to be anchored near the planet's equator to take advantage of the centrifugal force of its rotation. A polar space elevator is just dumb.
He also says it's 80 miles high. The actual length is many 1000s of miles. I think more like 2 or 3 Earth diameters.
Still, once he got into writing the script proper he would have (presumably) researched
and corrected these things.
As for the cloning business: Since he, even now, is reluctant to elaborate on how this would work, I'm guessing the details are sufficiently interesting that he thinks they might be recyclable in some future project.
The spidermorphs? Errr... OK... Doesn't immediately grab me. I'd need to hear more about this. There was a time when I was all for the Kenner Toys menagerie. But these days I like my xenos fairly plain vanilla. Maybe 4 arms like the Blomkamp version, but that's about it.
On the whole, though, an interesting read. Always fascinating what other writers come up with.