Re: Forget the risk of fire spreading through the holes in the wall
The wooden frame should have bracing as/where required to ensure it is rigid. Plasterboard should never be used as a structural element in a house - mainly because it isn't a strong material. Also, the plasterboard is usually fitted considerably later in a house. You put the stud-work up, then all the utilities/insulation are sorted out before you put the plasterboard on. I certainly wouldn't want to work in a house if a major structural element of the walls was missing!