Remember that this is just a simple project I developed for my university project along with my friends, so it may contain some minor mistakes. These mistakes may be due to visual paradigm tool's representative faults as we used it, in case of machine state diagram, the timings are not noted which is very important for them and the connections of class and domain diagram are also wrongly interconnected as they weren't the final drafts, but were attached by mistake by my friend. Hence, overall you can certainly take ideas from this UML Diagram but don't try to copy it as it isn't 100% accurate. Still I think it is fairly very easy to understand as compared to the one's on internet where people aren't viewing these diagrams from a students perspective.