No information given.
Sorry about the wait for a reply and I don't think I have the answer for you. I don't use the CK much and I am not aware of its maximum capabilities and how much work it can handle. However I am a 3D modeller and I think it could be possible depending on CK. I do need to wonder though why the last team split the maps up. This may suggest something about this idea and the practicality of it. However with so few recruits at the moment with none of us having much experience with creation kit we are kinda dead in the water. We can make models and write storyline but unfortunately adding it to the game is hard for us.
My CK experience is limited and I initially joined this mod as a 3d modeller to make stuff for it, not as management or CK. I am not ruling out both options at the moment as I don't know enough and it would be wrong for me to make big decisions at the moment.
If you want to help out that would be great and probably the first thing that would be discussed before we moved on would be whether to move to using the UE4 engine and from what you have told me it looks like you are knowledgeable of both.
The mod has been split into regions already which is a lot smaller compared to what it was before and I personally believe that it could be done. However I don't know the CK's limits compared to others.
For making it using the UE4 it would have to be discussed with whoever gets onboard with this mod. I am quite worried about legal though. The ASoIaF is such a big franchise I doubt they would let us make a standalone game for it. A mod I see less trouble with and less time consuming. To make a standalone game for ASoIaF would be a lot more time consuming than a mod. Don't get me wrong I love the idea and I will definitely put it on the to do list when I get some people involved.
Hopefully we can get some people on board and get it going again. The legal stuff should be fine at the moment but the engine might need to be looked at but there is no change planned at this moment in time and it is still going to be a mod for Skyrim.
That is my main worry. Legal stuff. It sounds like a good idea from the reading I have been doing UE4 looks like a good candidate but again I don't know whether it would be possible.
I do know with the previous leadership talked about changing engine but nothing came of it before they left. Also if we did this we would be making a whole new game nearly. I haven't used or really looked into UE4 (by UE4 I take it you mean unreal engine 4) so it is something we will consider. We would need to discuss it further before making a decision.
It was originally going to be the whole of westeros on the original project that wasn't split into different maps. Then Jed took over and it was split up. I don't know what the plans are now fully as Jed is no longer leader.
Might not have been following this for long but I believe that you have done a brilliant job and wish you good luck in your future endeavours and your successor will have a hard time filling your boots.