At the Advanced Technology Center of Lockheed Martin Missiles and Space, we have created an integrated optical, mechanical, thermal and structural design and analysis program called `Optics Plus'. This program is a rapid and accurate system for mechanical design and analysis of optical systems, including thermal, stray light and structural properties. Accurate cost and performance balancing trades are possible in very short time frames, thereby reducing overall costs previously much greater. There are three factors in its success: (1) An Integrated Team of analysists, domain experts and software experts that design, build and use the tool, (2) Integrated Tools that include OPTIMA, IDEAS, ASAP Plus, MSAT, and TMG, and (3) Outstanding Support from the laboratories broad expertise in optics, thermal and structural analysis. This paper will describe how the integrated system operates and a flow diagram will spell out the nodes of program interactions. The resultant will be demonstrated with several examples of cryogenic instruments.