The door window frame

Let's have a look at a reference image that clearly shows how the door window frame is positioned:

Note how the window fits in the door

Now let's model the door window frame. Basically its an extrude of faces along the lines of the blueprint.
Take a top view and in Face Edit mode select this face as shown in the next image:

Select this face...

Then apply the Subdivide command to the selected face:

Selected face subdivided once...

See next image. The face with the brown color is no longer needed and can be deleted.

Delete the brown colored part...

Switch to Point Edit mode and adjust the points to match the lines in the blueprint. The selected face becomes less wide.

In Point Edit mode, align to the blueprint

When you have aligned the points to the blueprint, it is time to start the extrusion of this face to create the window frame. Switch to Face Edit mode and start extruding the face. Keep switching views, so you can keep the extruded object aligned with the blueprint. You will need to scale and rotate the extruded faces to keep the object in line with the blueprint. Sometimes you even need to switch to Point Edit mode.

  
Extrude along the lines on the blueprint (top view)

Continue extruding until you reach the Roof. Make the extrusions the same size as the faces in the roof. This simplifies the corrections that you need to do later on. The final positioning for the frame will be done later in the same way as we did with the Front spoiler, using the Move command.

    
Continue extruding until you reach the roof.

To match the points of the window frame roughly, it is a good thing to select the Roof and set it to Point Edit mode. Now you can see the use of having extrusions the same size as the faces of the Roof. Matching the shape can now be done roughly on sight by moving the points of the Door window frame around.

Points roughly meet the shape of the roof

Now move the points of the Door window frame, until they match the position of the upper point rows of the roof.

  
Match the upper point rows of the roof!

When done, you should end up with something similar to this (see next screenshot)

This is what it looks like when done! Almost there!

The next reference image shows how the door window frame connects to the Side rear. In real life the frame is cut into two separate objects. We will not create a separate object for this, for the sake of simplicity we will continue to model the frame in one piece.

Reference image shows how the door window frame connects to the side rear

Continue extruding the door window frame. Pay attention to the seam in the roof and match that with the door window frame! See the red arrows in the next screenshot.

Note the seam in the roof!

Just keep extruding until you reach the Side rear object. Then move the points so they exactly match the points of the Roof. Then move the points slightly away from the Roof to create the necessary seam.

  
Points exactly match the shape of the Roof. Then they are moved slightly to create a seam.

When we take a closer look at the door window frame, you can see that the frame has a small indentation to make room for the Side Air Flap. So, let's model this indentation. In Point Edit mode, select the top row of points, starting at the seam, and move them down just slightly.

Top row of points selected...                                 and moved down a little to create the indentation..

To finish it all off we adjust the curve of the frame just a little so it widens at the end. Time to save your work again!

Screenshot of what we have modeled so far