It's a kind of a joke and just intended to show the "development" of a bomber, which starts
as a very clean and fast design, not needing defensive weapons, because of high speed.
Weapons are added, the canopy is raised for better view, antennaes are added for navigation
and defence, at last the structure is simplified because of ease of production, but with more
powerful engines, loss of speed is always kept "relatively low" ... :

The aircraft shown in the first step may have been influenced by the DH Mosquito, but those
drawings are just artistic license, an ironic way to show, what becomes of an aircraft during
its service time.