It will look lovely, I'm sure! Scrappy quilts are wonderful. Your plan sounds perfect.
One thing I do if I'm a little unsure, is to make several pieces, and then lay them out and see if the actual meets my minds expectations :) Sometimes I can see that I need to add/subtract more of particular color/pattern, or lay them side-by-side differently (mix them up more), etc. Laying out some pieces really seems to help me visualize what's in my mind. I know some people are really talented at 'grabbing from the bag and just sewing', but that hasn't worked so well for me (I don't think I'm as creative as they are!). I hope this helps you some, although I'm sure you already thought of it :)