Now we have to split it so that the door can be able to open. Zoom into the area at the door crease. Adjust the edges to fall along the door crease. Chamfer the edges shown in green by a value big enough to make a wide enough gap for the door crease. The image illustrates what I mean. Delete the polygons shown in yellow.
The next step is to separate the parts into two pieces of geometry. Go into element mode and select one of the halves and click the detach button. Close off each half by creating polys at the ends so there are no holes.
Next is the door handle. Once again, start with a box and perform some extrusions to get something like what is shown in the picture.
Adjust vertices to make the geometry taper. Split the geometry down the middle as shown by the green line.
Adjust vertices and then inset the top polys as shown.