A coherent Montessori curriculum - preschool

Montessori Education includes a concept of education where you teach the "whole picture" then individual parts so the child can see and understand a coherent whole. They can develop and understand relationships when they have a framework to work from. Cosmic education teaches the elementary child with a series of "Great Lessons" that begin with the formation of the universe and then move closer to the child.

I spent a lot of time thinking about the elements of Cosmic Education that seem relevant to a preschooler. As in a Montessori classroom, many concepts can be taught simultaneously and will appeal to the child that is the most interested. (I have a child in my own class that is learning to read from advanced "Shark" books because of their appeal to him.) I see several major curriculum divisions though, and I'd love to hear what others think. Many of these overlap in different ways.

First - There is the division between Earth and the Solar system/Galaxy/Universe.
Second - There is the division between people, plants and animals.

People can be divided into either timeframe or where people live. (I'm sure there are other ways to study people as well.)
Plants can be divided into ecosystems, geography or timeframe.
Animals can be divided into living/extinct, mammals/birds/reptiles/

insects.