Integrated Modeling is currently being used to assess the feasibility of a baseline design concept (pre-phase A), developed for the Coronagraph version of the Terrestrial Planet Finder (TPF) mission. This design concept incorporates many challenging design elements for a space-born observatory: including a monolithic 8 by 3.5 meter elliptical primary mirror; a 12 meter long deployable secondary mirror support structure; as well as a 14 meter long deployable, tensioned-membrane, V-groove sunshield. Unprecedented thermal and dynamic stability is required by this flight system to allow observation of enough contrast between planets and their parent stars. This stringent performance requirement necessitates a balanced system, designed to optimize the various interacting disciplines: optical, thermal, structural & control. To support design feasibility studies, a MATLAB-environment-based integrated modeling tool (IMOS: Integrated Modeling of Optical Systems) was employed for analyzing the end-to-end system performance for typical in-orbit maneuvers. Our integrated modeling goal is to use a single model definition file to specify the thermal, structural, and optical modeling and analysis parameters, improving results accuracy, configuration control and data management. In working towards that goal, we have had parallel efforts in IMOS capability development, as well as design concept modeling and analysis. Typical system performance metrics studied include the relative motions of the optical elements, as well as the deformation of individual optics, decomposed into best-fitting Zernike polynomials.