Panda, I think you've got a great plan and I'm excited for you
My suggestion would be to add in more veggies earlier on - are you eating much in the way of greens and fruit now? Maybe on week 2 get in 1 veggie and 1 fruit a day (or something like that). Fruit is important for vitamins and fiber, plus it's 'good sweet'. As you introduce more whole foods into your diet, it will be easier to start to cut back on/cut out the processed foods and breads.
Good luck
And remember that if you find you want to extend your plan to 3, or even 4 weeks, that's totally fine. You are finding what works for YOU, and that's how you succeed.