Several optomechanical tasks for the Los Alamos National Laboratory's (LANL) Free- Electron Laser (FEL) were set by the envisioned project goals as early as 1988. Unfortunately, the FEL project has been set aside due to funding constraints. The tasks reported on here required extensive modeling for final adaptability into the FEL environment. The systems to be described are best identified as (1) a Brewster attenuation device, (2) an optical mode relay lens system, (3) a spectral harmonics band-filtering system, (4) a 25-nm micropulse spectrometer system, (5) a 12.5-nm micropulse spectrometer system, (6) a 0.6-nm micropulse spectrometer system, and (7) a reflective mode profile rotator. The Brewster attenuation device was successfully used inside the FEL resonator. The optical mode relay lens system, spectral harmonics band filtering system, and reflective mode profile rotator were completed but never used. The 25-nm micropulse spectrometer was optically and mechanically completed, but the detector electronics were never finished. The 12.5- and 0.6-nm micropulse spectrometers were never assembled, due to hardware that was common to the 25-nm system.