The AXAF Telescope, built by Eastman Kodak Company's Image Acquisition Systems division, contains the world's largest and most advanced dimensionally stable composite metering structures. Tight dimensional stability requirements were satisfied requirements were satisfied for the 26-foot long optical bench by designing a laminate with low axial and hoop CTE and use of state-of-the-art cyanate ester resins to limit hygroscopic effects. Strict control of material and processes minimized CTE/CME variability. The design also had to consider launch loads in excess of 30,000 pounds developed from the 3,500 pound high-resolution mirror assembly and cantilevered 1,050 pound science instruments module. A complete verification program was implemented consisting of materials, parts, and static load qualification and acceptance testing of this 'one of a kind' structure. Composite materials were also used in the design of thermal-structural enclosures for the HRMA. These structures act as integrated thermal and optical baffles and structural support for the optical transmission gratings. The material and laminates were carefully selected to balance thermal and structural requirements. These structures were designed, fabricated, and tested under stringent thermal, structural, and cleanliness requirements.