When sourcing a 20ft container kitchen, you must prioritize structural integrity and material safety. Ensure the unit uses a standard ISO shipping container frame or a high-strength galvanized steel structure to prevent corrosion. The interior walls should be lined with fireproof materials such as stainless steel 304 or glass magnesium boards. For flooring, anti-slip aluminum checkered plates are essential for commercial safety. Additionally, verify that the electrical system (wiring, sockets, and breakers) is customized to your target country's voltage (e.g., 110V for US, 220V for EU) and includes GFCI protection for wet environments.