How many containers are needed to build 20 rooms (double rooms with private bathrooms)? What are the layout options? Do you offer single - level and multi - level stacking solutions? What are the price estimates for low - end/basic quality, mid - range, high - end/luxury finish? Please include prices per container unit and estimated cost for 20 - room project. Are bathroom facilities and furnishings included in the price? What are the dimensions and materials used for insulation, structure, and windows? Do you offer floor plans or 3D designs before production? Do you provide certifications or safety compliance for hospitality use? Give an estimation in medium and good quality for villa, hotel room furniture and what is included.