The AURA Gemini Project Office proposed a mild steel closed cell structure to support the Primary mirror for the 8 meter Optical telescope. This paper deals the fabrication requirements, the method of construction, and the assembly of such a structure. The final assembly of all the actuators, other equipment including the testing of the complete mirror cell using a special concrete mirror is considered.
James A. Lidbury, James A. Lidbury,
"Manufacturing feasibility, assembly, and testing of the Gemini mirror cell", Proc. SPIE 2199, Advanced Technology Optical Telescopes V, (1 June 1994); doi: 10.1117/12.176243; https://doi.org/10.1117/12.176243