Hands-on experience is critical for developing real-world OT security skills, but access to ICS hardware and realistic testbeds is often prohibitively expensive. GRFICS v3 helps close this gap by providing a lightweight, open-source platform for simulating industrial environments in software. Fully containerized for faster deployment and easier scaling, GRFICS v3 supports affordable training, repeatable testing, and research on ICS attacks and defenses. This session will cover what is new in v3, practical examples of how it is being used, and lessons learned in building modern OT security labs. Whether you are new to GRFICS or looking to enhance your existing training and testing efforts, this talk will give you tools and ideas to take back to your own environments.