Huh! That theory is fascinating. Let me see...
Oooo. I have found now, that the alt- contractor trailer is indeed a Mystery Model. Here is the original texture containing the image:

- TresNublar01.png (126.89 KiB) Viewed 3785 times
And here is my own attempt to clean up the map, very briefly:

- TresNublar02.png (439.42 KiB) Viewed 3785 times
Assorted renditions of mapping Isla Nublar from the novel may be found here (as I understand, none are from Crichton himself):
https://www.google.com/search?q=isla+nu ... iRyJrvL5OM
Here, at least, is the one published with the book - most likely to be viewed by the developers.

(Click on thumbnail for full size)
Hmmmm. That Eastern peninsula seems to be whereabouts the East Dock would go. Possibly the Sauropod Swamp is shown with a lake area. The Northern region
does seem a bit mountainous. Notably, the island is no longer tear-drop shaped...
And finally, I'd like to note that the location of the mountains in this old novel-Nublar map, are where Mt Sibo does end up being in (JPTG? and) Jurassic World. This seems fitting.
Possibly Isolt can perform a
texture upscaling on the original unpaletted texture shown above, to present an even clearer image of this vaguely developed Trespasser Nublar canon.