2. Is it possible for an unit to have two health bars - "main" and "secondary", which work in such a way that the unit is killed when the main bar depletes, but certain types of damage are absorbed by the secondary health bar and then by main health bar once the former is zero? (In a more advanced form a weapon-specific constant would define secondary/mian damage ratio). The secondary health bar could simulate an energy shield (if it auto-heals), a layer of armor (armor-piercing weapons!) etc.
3. Is it possible to vary damage received by an unit depending on the direction from it was hit (i. e. tanks are more vulnerable to attack from above and less vulnerable to frontal hits)?
Yeah I ask lots of questions,
