My first idea is inspired by a train. I picked it because when I was a child it was one of the toys I had.
I selected elements from the train to create the letters.
I started Sketching some letters based on my inspiration (Building blocks). I found that it’s not very easy to make the letter because the parts does not fit into all the letters, so I did some experiments by cutting shapes and using them to make a letter. I found this way helpful in order to see the skeleton of the letter and then sketch it.