For your custom RV shower door, we recommend sending photos of the broken door guide part so we can provide the correct replacement. Since the guides are riveted on, a replacement part will be sent to you that can be installed easily. Regarding the door assembly and water flow issues, reversing the plastic end caps on the rollers and swapping the frame and door handle positions can help redirect water flow properly. We understand the lack of included installation instructions is inconvenient; while these typically do not ship with the product, we are working to improve this. Please send us pictures of the door and any issues you encounter so we can provide detailed, step-by-step guidance to ensure a proper installation.