The "Ideal Curriculum" - History

I've been putting off the ideal mathematics & ideal science plans, mainly because there is such wonderful variation in those two areas. So, instead, I'll turn towards history, which isn't so much a plan as an outline. After all, I subscribe to the idea of using a spine and then using lots of real books and primary sources to flesh out the spine text; I'm not about to start enumerating all the possible supplemental sources. Here, then, is the basic plan I intend to follow with both FB & PC. EG's will look the same from fifth grade onward.

Birth Through Age Four
• Important parts of the American mythology introduced via picture books and as seasonally appropriate (e.g., Thanksgiving, George Washington, Paul Bunyan, The Star-Spangled Banner, The Ride of Paul Revere).

Kindergarten
• Ancient history through 400 C.E., utilizing The Story of the World Volume One: Ancient Times, the corresponding activity book, and supplemental history books and biographies.

First Grade
• Medieval history, the Renaissance, and the Reformation (400-1600 C.E.), utilizing The Story of the World Volume Two: The Middle Ages, the corresponding activity book, and supplemental history books and biographies.

Second Grade
• Early modern history (1600-1850 C.E.), utilizing The Story of the World Volume Three: Early Modern Times, the corresponding activity book, and supplemental history books and biographies.

Third Grade
• A one year concentration on United States History, using DK's Children's Encyclopedia of American History as a spine text.

Fourth Grade
• Modern history (1850 C.E. through the present), utilizing The Story of the World Volume Four: The Modern Age, the corresponding activity book, and supplemental history books and biographies.

Fifth Grade
• Year one of a three-year cycle, covering ancient times through approximately 1000 C.E., using History: The Definitive Visual Guide as a spine text.

Sixth Grade
• Year two of a three-year cycle, covering the remainder of the middle ages through approximately 1700 C.E., using History: The Definitive Visual Guide as a spine text.

Seventh Grade
• Year three of a three-year cycle, covering from approximately 1700 C.E. through to the present, using History: The Definitive Visual Guide as a spine text.

Eighth Grade
• One year of United States history, using Joy Hakim's Story of US series, Zinn's A People's History of the United States, Out of the Past, and other primary sources.

Ninth Grade
• Back to the four-year cycle, beginning again with ancients via History of the Ancient World.

Tenth Grade
• Medieval times are next, using History of the Medieval World.

Eleventh Grade
• Early modern era, using whatever SWB titles the third book. :)

Twelfth Grade
• Back around towards the present, again using SWB, this time the as yet unwritten and untitled fourth book.

That's the gist of it. As I said above, all of this would be supplemented with history books, biographies, primary sources, and so forth.