I know it isn't your job to ensure compatability with other mods, but since you do seem to be working to make Citadel compatible with Exerelin, I wanted to mention that I got this error when attempting to load the game:
fatal: ship hull variant or fighter wing with id: [FoxDreadnaught_elitevariant] not found!
Not sure what that means, but yeah. . . Oh! And I am running Exerelin 0.633 (the development build) if that is useful to you. Cheers!
(I'm also completely willing to admit that the fault may be on my end, so, if it is, disregard this post
)
Update:Yes, it was probably my fault. I deleted the Citadel folder and downloaded the hotfix version in the post just above mine and then put the .json and .faction files in their appropriate Exerelin folders. The game loaded without the above error. So, carry on, nothing to see here
Oh, the mod description for your 0.6.1B hotfix still lists itself as 0.6B in the mod list.