I need a complete design package for an affordable home that can be built quickly on-site using a modular approach. The footprint must stay very compact—about 550 sq ft—but still feel airy and bright. Natural lighting is the single most important sustainability feature, followed closely by cross-ventilation, so please let daylight drive the layout and opening strategy. Locally sourced, recycled materials should form the backbone of the envelope and interior finishes; if you feel bamboo or rammed earth could complement those elements, explain how, yet the primary palette must remain recycled. The structure has to be fully closable for privacy and weather protection, with a minimum service life of two years. Prefabricated modules that two or three people can assemble in the field without heavy machinery are strongly encouraged. What I expect to receive: • Scaled floor plan, elevations, and a simple 3-D massing model (any common format: SketchUp, Revit, or IFC). • Bill of materials highlighting recycled components and local sourcing notes. • Step-by-step assembly guide aimed at non-specialist labor. • Passive-design brief showing daylight studies and airflow paths. Keep the system practical, cost-effective, and ready for rapid deployment; aesthetics are welcome, but simplicity and buildability will decide success.