addition information
Space required for G3 is 5000mm(W) ☓ 5000mm(D) ☓ 2500mm(H)
Yes, that is the values also written on the Galaxian Theater flyer.
What would be the minimum empty space to leave between the walls and the Theater? Can it be assembled against the walls?
I've just tried google sketchup for the first time... I've done this in order to show you the V3 surface, including the Galaxian Theater.
Note that is the first preview... the room dimensions are not accurate, and things are missing... it's just my first attempt, but it already gives you an idea about the room...