Hi,
You should think about the basic shapes that build up your model and leave the detailing for the end of your modeling process. Instead of creating the red body and the green one on the bottom of it, you should create it as one body.
In the video below you will see that the tubular shape is created then I made an intersection. It was necessary to make the bottom part thinner than the diameter of the tube and get a clear overlap. The bottom part can be a simple extrusion which is cut to its latest shape later from a side view with a spline for example. With this workflow, the front curved shape can be created in one step.
As you can see in the video, you may have to play a bit with the fillets because of the projection and the splines.
Let me know if it helps,
ps: what you can also see on my recording, holiday playlist is on 