How big is a sound stage?

According to the pre-submission information, a sound stage at Marlow Film Studio will be about 5.5 double-decker buses long and almost 6 giraffes tall. And there will be at least 13 of those. These eyesores will be visible from far & wide, including Winter Hill and the Chilterns AONB. This is simply not suitable for Marlow’s Greenbelt.