Lybus, I totally misread what you wrote, so please ignore what I was saying, it's not pertinent. I thought you were being a whole lot less realistic than you actually are.
I would be very interested to see this outline. Hope you can find it gladius_veritatis.
Until then, I had several comments/questions, and I do apologize for the somewhat fractured nature I know this post will have.
First things first. This post was begun as a "a philosophical experiment with my fellow traditional Catholics." This raises the question, at least in my mind, of the relation between the political and the philosophic, and to what degree they are compatible. I'm inclined to believe that they ultimately are, but that they are anything but easily paired.
I also really liked the point brought up about having "saintly kings" and what will be required to have them, though I personally don't feel ready to leap that far ahead in the discussion. It seems like first we'd need to bang out more on the family's relation to the city, the structure of that family, and education of children.
There were also several comments regarding the family, and this seems to be a very important starting issue - the relationship between the family and th city, or the private realm and the common good. The city necessarily requires people to attend to the common good, and this can come at a cost to the private realm. The prime example of this is war. Citizens must defend their city, even if doing do requires the sacrifice of their own lives. This... doesn't seem to be in the best interest of the individual. Of course, in a Catholic state, there are religious reasons to spur the individual on, but it seems there is still a tension there. (By the way, can we agree that every human being naturally seeks his own happiness?) The family represents a potential challenge to the common good, with a father inclined to place the good of his loved one above that of other citizens, and the city itself.
Lybus, I'm still very interested in this tripartite division you're proposing - do you think you could explain any more of it?