I want structural design , including the layout, electrical, plumbing, interior, exterior guidance for constructing, 2 identical rooms with sitting area at the front and at the back, measuring upto 600 Square Feet maximum

I am looking for experienced structural designers to help create the perfect layout for two identical rooms with a sitting area at the front and back, measuring up to 600 square feet maximum. The interior design should be modern, and I have a rough idea for what I would like to do with the electrical and plumbing layouts, as well as the materials and finishes to use in the construction. I need detailed guidance on how to turn these ideas into reality, so I am looking for professionals who can advise on the best ways to do this and make sure that everything is implemented correctly.