WOW, congratulation it looks amazing
. I love that people are starting to use objects and textures I made and I see it helps democratize track making.
Here is my few cents:
1: The concept and overall look
The concept is amazing I love the theme in fact there is an easter egg in hacienda about the infamous Area 42. You packed a lot of details and very cool stuff. My only suggestion would be to have more distinct area, like one area is the military base entrance, another one is just pure desert (with only cactus and tumble weed), another one is inside the canyon and finally the grotto. It helps to define more clear area.
Right now there is a bit of military hardware everywhere some server everywhere and some alien stuff again everywhere.
I would have done it in a way where you are in this dry canyon and suddenly you see the entrance of area 42 like you are revealing a secret. I also love the fact you included some very cool things like the SSAO van! Kudos.
2: Gameplay and drivelines
It's fun to drive and I think you did a brilliant job. I also am amazed you did transitions between the road and the surounding which make it blend nicely (the upcoming version of stk have a shader that can do that for you).
It would be nice to have a road that goes in the military space (even if it's closed), it adds realism.
3: Atmosphere and general look
The twilight light looks really impressive. You could add light for the floodlight (currently they are only models and don't emit any light, it would be nice to have them lit the road).
I wouldn't have put the alien sign on the canyon but maybe the alien font could go in the UFO crashed. You could also include a few aliens from XR457.
4: Details to make it perfect
a) Put the warning sign outside the fence so we can read it. Also make the background of the sign less grungy so we can read it. I would also put something funny like:
Area 42
Warning: Military Installation
No trespassing
Trespassers will be shot
Survivors will be shot again
b) There are a few servers models for Alien Signal with weird alien messages (and sound) they could be nice close to the UFO
c) The starting portal with the alien font part is a bit out of place there. Imho it would be cool close to the UFO
d) A few military camouflage could be cool in some parts (like the defense towers, etc).
Conclusions:
Those are mainly details and the map is good on it's own. I hope you don't take it too bad, I had a great pleasure discovering it!