That is a lot to ask of any Terraformer.
I am interested in doing this but am unsure.
Would need more specifics before continuing.
I have done terraforming and "huge" trees before (not all of them were posted as I have done private builds).
As for the mountain, well thats simple enough.
The rivers, also fairly simple.
Adding custom (tropical) trees, little bit of time involved.
All in all this kind of thing will take a lot of time and effort.
Message me in private if you like.
