I am currently in the process of making an embedded system port of the CPython 3.0 Python interpreter and I'm particularly interested in any references or documentation that provides details about the design and structure of code for Release 3.0 or even about any of the 2.x releases.
One useful document I have found so far is this informational PEP on the implementation - which is a good overview - but is still pretty high level. Hoping to come across something that gives [much] more detail on more of the modules or perhaps even covers something about porting considerations.