Assuming those rods are about 500mm between end supports (based on pic 0068 and the size of the platter) the deflection in the centre is around 2um (2 x 1e-6m) per kg

Won't bow as much as you think because the supports are fixed not simple.

I'd guess that table weighs 25 - 30kg with the slide mounted - so deflection <0.1mm in the middle...