the textures on the ship must be MUCH MUCH higher resolute than now if its that size ( or so i d guess ) ... other than that.... it would need a different mod to really use ships of such epical size. ( or rather a mod that scaled down every ship down by 10 times )
what such a ship would be really awesome is to be the rheinland HQ ( maybe undockable - but something like a huge weaponsplatform in a guard system )
making such a ship playable takes away "epicness" cause it wouldn t be unique anymore ... making it an admin approved ship only means that certain game mechanics need to be taken into account ( especially balancing - and manouverability ) ... but to be an ultra heavy weaponsplatform in a custom guard system is something that would make it WORTH discovering ( and dieing for ).
imagine.... you enter the RM guard system and somewhere - against the sun in like 140k distance, you see the silhouette of such a ship. ( that is - if you place the system entry in a way that you inevitably have to look at that shape when entering ) - many a pilots would die trying to get close to it - just to look at it.
without such "landmarks" guard systems are very often boring - not worth to discover... all you see is a few bases and generic planets if you re lucky, nothing really characteristic for a faction.