ANDES is a high-resolution spectrograph, extremely stable and fed with fibres, under the development for the ELT Telescope. This paper contains an overview of the Phase-A design status of the opto-mechanics and Optical Bench structure of the visible arm of ANDES, including a materials trade-off, several FEMs and lessons learned from the projects in which it has been inspired: HARPS and ESPRESSO. The baseline design of the phase B consists of three arms covering simultaneously the wavelength range 0,35-1,8 μm. Phase-B designs are going to be directly applied from solutions for Phase-A, since neither the layout nor the optical elements have changed dramatically.