Killer Wolf made it in Isis Interstellar as a predecessor of King Cobra. Unfortunately both KW and the official homepage are missing long time ago, moreover there is no license in the package.
Well, this was bound to happen I suppose. I always try to figure out if someone is currently working or has worked on something similar to my current plans, but given how many years this community has and how many extensions exist out there, it can be difficult to find certain things out. The wiki and in-game extension managers are my top places to search, and I could not find any mentions of such Cobra Mk. IV before.
If in this case I have not follow some sort of etiquette when creating a new OXP, I do apologize for it, but I would also be happy if someone would please clarify to me what could I have done differently.
How to square the existence of these different Cobbie-4s? Perhaps if you ensure that the ship identifier (in shipdata) of your version is different to the Killer Wolf one
If you mean from a technical point of view, then there is no problem. The way Oolite handles textures is basically by defining new ships for each texture. All the 9 textures in this OXP here (and their NPC versions) have quite individual names starting with "gsagostinho", so there is zero chance of conflict with whatever the other OXP has defined as ship names. Now if you mean how to explain why the Ooniverse has two Cobras Mk. 4, then I don't know except to say that you don't need to install both OXPs.
that's all you need to, aside from stick a message in the readme (or equivalent) saying that someone else got there first and that (given the lack of license) you haven't used his code or designs.
But someone got what first, simply named a ship? If anything, the inspiration for such heavier Cobra comes from Elite Dangerous, where Frontier did create a Mk. IV which is a heavier but better shielded version of the Mk. III. I am 100% of the time giving credits to absolutely all authors I base my work on (in this case, it has been only Griff with his model and original textures) but given that I was unaware of the existence of such OXP up to now I don't see why this would be necessary nor how the person would be credited. Could you please clarify to me why you think that is necessary?