Just had a closer look at your pictures. To access the carport, you will remove that paling fence (or part of it) enough to allow access directly from the street.
Andy has taken this minor but important fact in his design, in fact, why don't you engage Andy to design it for you, he will get all the permits, design it so its structurally sound, and you can then DIY.
You may be living in the northern part of the US, where snow loads may be a factor, or in New Orleans, where cyclones become critical factors. Andy should be able to establish these fundamental requirements.