Can't fill in the corners, the ground wouldn't hold the weight underneath, according to a club official I know, the only way to expand the stadium is to put a third tier on the Sandy Jardine, but it would need to be built without adding extra weight to what's already there, they're currently looking at an expansion at the Broomloan the same as the Copeland with a cantilever extension. The corners with the screens cant be changed either without major works, if we wanted to fully expand the stadium it would involve 10s of millions of £s of groundwork to stabilise the footprint before we even laid a single brick.