Produce new document on LArSoft geometry and update existing material.
Document the details of the LArSoft geometry description. This needs to cover some of the assumptions that are made in the code to make them visible (with the possibility of the assumptions not being correct.)
Also update the existing documentation and point to new document (when ready).
a) wiki - https://cdcvs.fnal.gov/redmine/projects/larsoft/wiki/Geometry