Hello, i have read your project description, i understand what you want, and i would like to offer you my services. I can implement create the ER diagram and tables in MySQL WorkBench as requested. I have excellent knowledge of MySQL and related technologies, plenty of experience with them, most importantly including experience with designing complex MySQL databases and creating ER diagrams, so i can finish this project quickly and to your full satisfaction. Feel free to contact me by private message to discuss the details. I'm looking forward to our cooperation.