Here are some more screenshots of how my car body has developed from the previous screenshots, as you can see the form is much more solid and visible.

The images above show further developments of my car concept, I have developed the back further, as well as adding a bottom to the car and some windows on the sides.

Here I have displayed some screenshots of my character's vehicle which I have began to create, I have used the same method of building the car as I did to build the body, this method seems to work very well as it gives me the symmetry that I need for the car. Once I am happy with the shape I will take the mirroring off and give the car some asymmetry to make it seem more realistic.

Here I have displayed the beginning of the destroyed part of my building, this has been created using the interactive split tool, once I had the shape I wanted I simply deleted the faces that I didn't need.