Maybe this issue is for tooling independent implementors (the ones not (yet) using FAIR in a box).
Please make sure all needed info to implement the model can be found in one place, or at least indexed in one place so that users can find it easily.

-Diagrams: https://github.com/ejp-rd-vp/CDE-semantic-model/tree/master/docs
-Unified structure: https://github.com/pabloalarconm/PERSEO/blob/main/cde_implementation/sparql/complete_cde_model.ttl
-Modules/context dependent OBO types a.k.a. glossary: https://github.com/ejp-rd-vp/CDE-semantic-model-implementations/blob/master/CDE_version_2.0.0/CSV_template_doc/unified_csv_template.md

Thanks to a meeting w Pablo I could take notes/steps to implement the model that cannot be found in one-only Readme:
-check glossary: https://github.com/ejp-rd-vp/CDE-semantic-model-implementations/blob/master/CDE_version_2.0.0/CSV_template_doc/unified_csv_template.md
-check the complete model structure here: https://github.com/pabloalarconm/PERSEO/blob/main/cde_implementation/sparql/complete_cde_model.ttl
-check diagrams here: https://github.com/ejp-rd-vp/CDE-semantic-model/blob/master/README.md
-add (repeat in each module) the SIO structure here: https://github.com/pabloalarconm/PERSEO/blob/main/cde_implementation/sparql/complete_cde_model.ttl
-add (repeat in each module) the OBO classes: https://github.com/ejp-rd-vp/CDE-semantic-model-implementations/blob/master/CDE_version_2.0.0/CSV_template_doc/unified_csv_template.md
-check that all "option lists" / "one of the following" in your data match the ones described in the glossary and match the CDEs.