I have completed my 3D environment.
I feel this has met my requirements, the entire environment was build differently that I had originally intended but it looks the way I have planned it to look like.
I originally planned to build my environment using a plane and standard primitives, but after viewing a tutorial and referring to production notes on the push and pull tool I was able to create the cliffs easier and faster. I also originally intended to build a track surrounded by cliffs but I built a track on a ledge on a cliff after learning how to create cliffs with the push and pull tool.
My target audience was aimed at 12+. I feel that with both my model of the car and the environment I have met that requirement. I had chosen to aim this at 12+ and people who enjoy racing games because my car is equipped with weapons as shown in image 1, so violence will be involved and may not be suitable for those under 12.
There are more weapons added to my car than some industry created cars with weapons as shown in image 2. If I was going to aim my car and environment at people at 3+, I would not have added weapons to my car as shown in image 3, this way the game would not be too violent and would be suitable for them.