i've been there, and i can say this, every ckd mercedes car built there are hand weld, all of the component were assembled by hand not a single robot are use except during painting, where they dip the car in paint tank, not spray gun paint, and every car must pass a very strict qc, and if even there is single flaw the car will be allowed to be sold to customer.

BTW, not sure if everyone is aware but Hap Seng is the biggest Mercedes Benx dealer in the world.