This study explores the design and development of large-scale floating structures, addressing current challenges in floating architecture while focusing on technical feasibility, energy self-sufficiency, and sustainable water management. A mixed-method approach combining qualitative analysis of existing projects with quantitative modeling and simulation was employed. The research proposes a modular hexagonal design with a 25 m diameter and 6 m height, demonstrating structural stability with a metacentric height of 0.8 m. Each module can produce 96,500.99 kWh of energy annually using solar panels and collect 325 m³ of rainwater per year. The design incorporates water management systems, including separate treatment for wastewater. This study contributes to the growing field of floating architecture by offering a flexible, scalable, and sustainable solution for large-scale infrastructure in marine environments.