印度采购需求：预制房屋，集装箱房屋，集装箱厢式货车房，预制房屋，模块化建造，预制集装箱房屋

I would like to inquire about the availability and pricing for purchasing 50 units of residential properties, specifically focusing on ground floor plus one additional floor, each covering an area of 4000 square feet. It's essential for these units to meet quality standards and adhere to the construction regulations prevalent in the market. Additionally, could you please provide details on the estimated lead time for production and shipping, as well as any customization options available? I'm keen on understanding the warranty and after-sales service you offer, as these are significant factors in my procurement decision. Looking forward to your prompt response!