I need a good looking, technical A1 poster created

Attached is a rough outline of a A1 format poster I would like to create as extra to a book I am selling. The poster should be summarizing the key topics from the book.
It will be less/not of a marketing poster, but a more "technical" explanation of a flow of activities - please check the attached. It would be good if you have done such before and have examples in your pph profile.
Thank you so much,
Frank