Honest model. Projections from a calibrated reduced-order model and bottom-up cost estimates, the current formulation iteration. The strength ceiling, cure kinetics, carbon balance, and cost build-up are all confirmable in the validation campaign. Compressive strength is capped at the physical limit for a cellular bio-stone at the shown density, and a flag appears when a mix is pressing that ceiling. A foundation pour reaches the ceiling only by going dense, which trades away the weight and carbon advantage; that tradeoff is shown live.