I think: the repair cost from 0 hp would not be the full cost of the facility because if you salvage it you could get some resources from the scraps, which is... which is how many percent of the full cost?
So I understand the puspose of the special claimable derelicts. What if the first derelict were a such derelict? So the player can choose not to plan an own ship but move in the derelict. (It seems the same unbalance problem. So the first derelict could be a special of the special derelicts (
): The player can gain a huge amount of resources from it (but the amount of the 'starter resources' were negligible). So he must first discover the derelict and only then can build his ship.)
This reminds me a wish: the option to save the scheme (hull) of the ships, so you can load this in other game's ship-sketch.
And I have a different wish: be able to open the vents in the hangars.