Okay, what you just said is outright incorrect.
Take a look at the screenshots again: Here is the
modded Cartel Cruiser engine bay compared to the original Landstalker engine bay.
As you can see, it has just as much detail as a default GTA SA car.
To compare, here is the
modded Cartel Cruiser versus the
original Cartel Cruiser:
Another detail worth noting in the above screenshot is the detail on the grille of the car itself - in original GTA 3, it is only a flat texture, whereas in the modded version it is a modelled 3D grille similar to the one of the Landstalker (see the first screenshot to compare the Landstalker's and Cartel's grills)
Here is a screenshot to further demonstrate the difference:
Then we move onto the interior - the textures inside have been replaced with SA ones, and the steering wheel is that of GTA SA.
Stop pulling these statements out of your arse, Venom.