Funny, Funny stuff. Since Morrowind, the game world (no s) has not been to scale. Oblivion's version of Cyrrodil was slightly larger than Vvardenvel, which is supposed to be MUCH smaller than Cyrrodil. http://www.tamriel.fr/images/oblivion/cartes/cartes_tamriel.jpg
And before Morrowind, the maps were WAY larger. I.E. Daggerfall, given that it was mostly randomly generated terrain. Point is, unless their engine is made of magic crystals, it won't be that much larger.