First off, thank you for reading the book with care! Over the years I have seen a lot of trouble with GTD because people were too inconsiderate to read properly.
To give an answer to your question, I think it is okay the way you describe it. I have found it important for the Weekly Review, which is the second most important thing in GTD (the most important is "doing" obviously), to have a clear-cut overview of all your commitments. You have to be able to see if you are overcommitted and be able to re-negotiate fast, otherwise you'll build up avoidance to the process and crash.
A problem I can see on the horizon: what is, if one of your projects accumulates so much material that the sublist functionality of the Google crap you are using is not enough? Then you will have the split you are now avoiding.
Tags for this Thread