cx (like c1) = class / size of the module
HRP = hull reinforcement package
thermal and heavy duty are possible engineering blueprints for HRPs.
What I say is that you should always apply either lightweight or heavy duty engineered reactive armor to a ship,
depending on if you go for speed/jumprange or durability. The resulting weakness to thermal attacks (lasers)
can be mitigated by a single thermal resistant HRP. All other HRPs should be engineered with heavy duty.
In case of a Vulture, that would look like mine:
A ship builder, outfitting and comparison tool for Elite Dangerous
s.orbis.zone
Balanced resistances and a fast recharging bi-weave shield.