You do not need to read it front to back. If you are primarily interested in one model, go directly to that part. Within any part, if you want the committee's bottom-line working positions before reading the full analysis, Section 3 and Section 4 are the most direct path. If you want to understand the legal mechanics and what would actually need to happen to implement a model, Section 5 is where that lives.
If you are moving between this document and the The Governance Options Primer, the section structure above provides a map for deeper reference: legal and charter specifics are in Section 5, unresolved design questions are in Section 4, and committee findings and comparative research are in Section 3.