The side rear
Before we continue with the Side Rear object, we need to change our
blueprint setup just a little. For modeling the Side Rear object you also
need to have a blueprint of the rear of the car. This is fixed easily! In
the hierarchy in the Blueprint level, select the Front object and duplicate
that. Select and rename the new object (called Copy of Front) to 'Back'.
Then open the Property window for the Back object, at the Col tab and select
the appropriate image in the Texture field. Take a side or top view and
move the Back object into position.
To create the Side Rear, which is located next to the door, we use a copy
of the door. The procedure is the same as we used before. Duplicate the
door, rename the object to 'Side Rear' and delete all unnecessary faces.
Extrude the Side Rear to match the blueprint and keep going until you reach
the wheel area:

The selected edges are extruded... and form the
Side Rear as seen from the side..
When you have reached the wheel area, you go to Point Edit mode to make
sure all points follow the blueprint.
In point edit mode move the points around to match the wheel area
When done, set the Edge Sharpness like shown in the next image. The yellow
lines indicate the edges that must be set to 'Semi sharp'; the red lines are
edges that must be set to 'Sharp'.

Make the yellow edges semi sharp and the red edges sharp.
Take a top view and align the mesh to the blueprint as well. Like
before, selecting a vertical row of points and scale them, using the end tip
of the coordinate handle will do most of the time.

Before..
and after.. note the red arrow here!
Now continue to model the Side Rear from the top and rear view:

Top view..
Rear view..

Top view...
Rear view
Creating the seam for the Rear Spoiler is easy! Just follow the steps shown
in the next five images:

Select these faces and subdivide them once..
Delete the marked face..
Note: the marked face is deleted, to make sure that there are no small areas
which may shift in height and later on cause rendering artifacts. So, the
face is deleted, and in Edge Edit mode the remaining edge is moved outwards
to be aligned with the rest of the faces.

and move the edge to align it..
Then select these small faces... Extrude them downwards and then delete
them..

and you have created the seam for the Rear Spoiler!
And this is what we have created up till now (seen from the rear):

Rear view of our Lamborghini so far...
Time to save your work again!