Another excellent one, mate.
Just some side notes on a couple of things about the CoC SCW army lists that have me puzzled. The Republican "People's Militia" list has a Delegado (elected Delegate) in charge of a section (Grupo or Pelotón) which is fine but states a Jefe ("Chief") commanded a Centuria (Company equivalent) which is wrong. In anarchist columns Delegados were present at all levels so Delegado de Grupo, Delegado de Centuria, Delegado de Agrupación etc.
The POUM militia was Marxist so used army ranks, as did the other non-anarchist militias, however the POUM had the same practice of elected commanders, no saluting, "comrade" instead of "sir" as the anarchists. Orwell mentions he was appointed Cabo (corporal) and later acting Teniente (Lieutenant).
"Jefe" seems to have been used across the Nationalist forces as an informal alternative to the corresponding army rank but is most associated with Falange units where it seems to have a more formal use in their unique rank structure.
(Uniformes militares en la Guerra Civil Española – JM Bueno)
The org structure described in the lists is also strange. The Durruti Column started off with the basic unit of 10 militia (Grupo). 10 X Grupos = a Centuria. 5 X Centuria plus support units = an Agrupación (Assembly) and a varying number of Agrupación plus support units formed the Columna.
However the Column was reorganised soon after with a new structure that more closely mirrored the regular army; 25 militia to a Grupo, 4 X Grupos to a Centuria, 5 X Centurias to a Batallón (Battalion), several Batallón to a Columna. Delegados were still retained though. Other CNT-FAI columns may have retained the original structure or had their own.
The POUM had an organisation similar to the regular army throughout; 20-30 militia to a Pelotón/Sección (Platoon or Section), 3-5 X Pelotóns to a Centuria, 5 X Centurias to a Batallón, varying number of Batallón to a Columna.
(Durruti: The People Armed – Abel Paz,
Revolutionary Warfare: Spain 1936-37 – Chris Hall)