Developing our VRET system for claustrophobia came with several unique challenges. Ensuring clinical accuracy required close collaboration with psychologists to align the experience with evidence-based exposure therapy. We had to carefully balance realism and sensitivity to avoid overwhelming users, while also integrating real-time therapist controls for safety. Optimizing performance across different VR devices, preventing motion sickness, and designing a smooth therapist interface were key technical hurdles. Additionally, maintaining data privacy, tracking user progress securely, and ethically testing with real patients added further layers of complexity to the project.