I've thought about a few of the candidates in a proto-version of this before, but you did a great job of making the whole thing clear. I agree and I do think it's a fascinating case study.

It will also be interesting to see what happens when one of these gentlemen is actually nominated. I think if it's Romney, the fact that he's absolutely willing to say anything will mean that he'll keep everything more or less together, until he loses the election because his base won't vote for a Mormon and they have no reason to trust him on a single issue.

But if it's anyone else, the fact that the cleavages you've mentioned have actually been personified means that by definition, significant portions of the GOP will be REALLY upset with the choice:

If it's Rudy or McCain, social conservatives will absolutely shit themselves;
If it's Huckabee, neither financial conservatives nor the rabid anti-immigration folks will like it;
If it's Thompson, the entire party will be upset because he will tire of the campaign and quit in July;
If it's Hunter, Paul, or Tancredo, the entire party will be upset because it will be the first time in U.S. history that a major party candidate for President fails to hit double figures in the election returns.

Honestly, I'm almost hoping it's Rudy at this point. Fresh n' Fruitygate or whatever we decided to call it, along with his other maladventures, make him a pretty easy target in the general, and if the GOP nominates a pro-choice, pro-gay, anti-gun crossdresser on his third marriage - AND THEN, JESUS HELP THE RELIGIOUS RIGHT, HE LOSES - I don't see how they even keep that party together.