FRIDA (inFRared Imager and Dissector for the Adaptive optics system of the Gran Telescopio Canarias) has been designed as a cryogenic and diffraction limited instrument that will offer broad and narrow band imaging and integral field spectroscopy (IFS) capabilities with low (R=1400), intermediate (R=4000) and high (R=30000) spectral power resolutions to operate in the wavelength range 0.9 – 2.5 $mu$m. Both, the imaging mode and IFS observing modes will use the same Teledyne 2Kx2K detector. This instrument will be installed at Nasmyth B station, behind the GTC Adaptive Optics system. FRIDA cryogenic opto-mechanical design building blocks, mechanisms and FEA analysis are described in this contribution.