Picked up the new glass late last week . . . I went for 8mm as the price for 10mm (which I originally wanted) was nearly double AND I wanted to minimise the weight where I could.
8mm seemed sensible . . . as 6mm would've just looked too thin IMO.
I sat the glass on the plates and it seems to be pretty even . . . I'm hoping to avoid the need for adjustable feet but need to spend an hour and just get it finished.
I'll post pics when I'm happy.