Exactly because of this, designing a stealth fighter is not difficult. After all, one just needs to imitate the design of the stealth fighters of others.
But if you want to know why the nose, fuselage, wings, vertical stabilizers, and air intakes need to be designed this way, it becomes frustrating.
Others have gone through tens of thousands of designs and tests, repeatedly modifying until perfect.
As for the materials of the fuselage...
Without close contact, one shouldn't even think about knowing what kind of paint or Absorbing Material is used.
Every test and modification means spending money.
A minor change, a few dozen tests, and tens of millions are gone.
Poor and weak countries with industrial and technological strength not strong, who can bear this?
