It might not be 100% Canon but it is a compromise, you allways could say that K7 got rebuild somewhere between TOS and STO with bigger size but same design making it one of the more important Space Stations.
...oh and proper Docking Procedures would be nice too, would give us something to do in those *Warp In - Full Impulse - Beam Down*-Instances and improve immersion.
Just a note, the bigger the surface, the worse the texture'll look. Only option's either using higher resolution textures, place a different texture scaling, or cut the station into multiple peices, none of which are all that easy.
1:1 scale would be crazy to use for K-7, but having as big as it is and using textures, for the Windows as it were 1:1 scale is also crazy.
another thing: in Sector Space, please show the Stations, it was done for DS9 (the inner ring is missing there btw.) and that one Fleet Action base, Starbase 39 in the Sierra Sector and K-7 should Also be displayed in Sector Space!