Lost motivation since then for the project and also had other things going on. So I'm just going to present it here now for everyone to use: The Jurassic Park mod.
The basis of the mod is the nature's paradise mod. Only a few textures have been modified. Still I hope it gives a distinctive atmosphere
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Download: http://www.vinummusik.de/Trackmania/JurassicPark.zip
I also had accumulated a few materials for such a track...mostly sounds and images...if you want them, here's a download (84mb):
http://www.vinummusik.de/Trackmania/JurassicPark%20Materials.zip
Btw. if anyone still wishes for such a community project or even a completely different one and wants to organize it: Please do so :thumbup: