Thin-ply High Strain Composite (HSC) structures push the capabilities of commercial analytical tools to their limits, specifically in terms of predicting the complex time, temperature and strain dependent response to long term, high strain stowage. This work has developed and demonstrated a predictive engineering workflow for thin-ply HSC space structures based on a combination of novel high strain thermomechanical material characterization, HSC structure conditioning and metrology and commercial multiscale material modeling. Tensile testing of a relevant resin system preceded high strain Dynamic Mechanical Analyzer (DMA) scale Column Bending Testing of a variety of HSC laminae. HSC structures were produced and exposed to relevant time, temperature and strain histories to assess their life history driven dimensional stability. Results of material and structure characterization informed calibration of a multiscale thermoviscoelastic material model. The engineering workflow was then demonstrated via an explicit structural finite element model of an HSC deployable structure, using the calibrated material model, undergoing long term stowage, dynamic deployment and shape recovery.