Helpful drawings for the next project

My father’s friend is an engineer. He is not working in any company because he is a freelance worker. He does not like the idea of having a boss, which is why he decided to do a freelance job. When he gets a project or making a design project for someone, he always checks online to see the latest drawings and nice drawings which he can add on his current designs. He does not want to disappoint his client/s that is why he is searching online to get the best designs. Just recently, he was hired to make a design and he contacted my brother to work for him. So, they both are checking on cad library online to get an idea on how they are going to make a perfect design that would make their client happy and smiling. Indeed, they want to satisfy their client so that on the next project, they will for sure be hired again.