Any idea of what the PC case weight is? I'm assuming it doesn't weigh quite as much as the ~2.1kg Alum case.
PC is a little less than half the density of Aluminum (1.20g/cm3 to 2.7 g/cm3). So if the weight is 800g that means the aluminum case itself is 1300g (ignoring plate and rest of build).
So if Auminum case is 1300g, PC case would be about 577g.
So 577g + 800g= 1377g total, as a ballpark weight
But hopefully Louis has an exact number