Hello, Cmdr Steel.
Hulls in ED make absolutely no sense whatsoever, at present.
We can take an unshielded ship, fly it in a battle until there's only 1% hull left, jump into hyperspace, reappear in a complex solar system (where our ship may briefly pass through the convection zone of a star before slowing to supercruise speed), fly through the star's atmosphere scooping fuel, before finally flying off home for tea. Later on, assuming nothing else changes in this area, we'll also be able to fly through the atmospheres of gas giants and into the depths of oceans.
All without experiencing any ill-effects whatsoever, despite our ship being riddled with potentially thousands of bullet-holes.
I'm not even clear about what the hull is supposed to be at present: is it the exterior fuselage, the armour (which might or might not be the same thing in ED), the internal bulkheads, the spaceframe? Some or all or none of these?
In my view, ED should have a slightly more articulate system than the simple RPG-esque health percentage currently in use. What we have works, but it's not very convincing.
- All ships should have a high-density spaceframe1, which would be exceedingly difficult to fix outside of a station or port. It's integrity would be our most-important measure of ship's health - and the thing we must come home to repair.
- On the outside, we should have the hull. All ship's hulls should be automatically self-healing, as a matter of course. Self-healing armour2 is one of the first applications any remotely-competent space-going culture would develop - and especially a highly-militant culture, like the people of ED. It's something under development in the present day and some self-healing internal components have allegedly been in military use since the 1970s3.
The resources for repairing current hulls might be replenishable, like the internals, or might contain exotic materials that necessitate a return to base. FD's choice, obviously.
- On the inside, we should have the internal bulkheads (which would include the floors and partitioning walls, power conduits, etc), with damage repairable at our discretion, or ignored at the risk of life-support failure (and probably other malfunctions, due to the reduced environmental control).
FD might have something planned for the future - a Ship Internals update is certainly expected at some point, although not soon, I think.
I've no idea how much detail FD would find practical to go into, but any steps forward would be most welcome.
1 A spaceframe is what ED currently calls an airframe, when it mentions it. Airframe's not incorrect, as such, but I think it's wrong for the ships in ED, given both their extraordinary capabilities and the possibility that some ships will be designed never to enter an atmosphere. Plus, it sounds cooler, IMO.
2 See http://www.popularmechanics.com/tec...armor-patches-itself-within-minutes-16773095/ .
3 See https://en.wikipedia.org/wiki/BMP-3#Countermeasures .