I know:

HpMount - It's for the height of the ship about this kind of hover pad when landed.
HpContrails - It's for this dust trails which are created when you fly through space.
HpRunningLight - It's for the blinking or glowing lights all over your ship.
HpWeapon - It's for the place where a weapon is attached to the ship ans the weapons orientation.
HpTurret - Same as Weapons, but fpr turrets.
HpShield - It's to define the place where the shield generator is mounted.
HpCockpit - It's for the point where you look from if you are in cockpit view.
HpHeadlight - It's for the headlight on your ship.
HpCM - This defines the place where a countermeasure dropper can be mounted.
HpMine - Same as HpCM, but for mine layers.
HpTorpedo - Defines the place where a torpedo or cruise disruptor can be mounted.
HpCloak - Defines the place where a cloak generator can be mounted.
HpDocklight - This is for the lights which only glows or blink when you dock to a base.
HpEngine - This defines where an engine exhaust is.
HpFX - Effects form effects.ini can be applied to this HP.
HpPilot - This is where the pilot model is mounted into the ship.
HpThruster - This HP defines the place where a thruster can be mounted.

So that a pretty much HPs but this are only the one where you can get an idea what they do form their anmes, but what about the others?

Hi!

I just saw that you forgot some hardpoints:

HpTractor_Source = This is the place, where the tractor beam is mounted. The graphical effect, when tractoring is also coming from here.

HpBayDoor = This has something to do with Baydoors (animated?), but I'm not sure, what it is needed for. However in the shiparch.ini are also references to the HpBaydoors, so that they might be useful.

The only other hardpoint, which the original FL ships have is a HpEngineGlow hardpoint, but I'm again not sure, what it is needed for.
Most of the custom ships I know do not have hpBayDoor and HpEngineGlow hardpoints, but they function perfectly. Therefore it seems, as if these hardpoints are not absolutely necessary!

One more thing: If you have ships with several parts, which can be destroyed partly (like flying around with only one wing, because the other one was blown up) need to have some Dpzzz hardpoints (For parts that can be damaged or blown of).

Hope this helps!

I think that the HpBayDoorxx have something to do with the cargobay doors of some ships that open if you jettison something. You can see this best if you have a corsair ship.