Manpower - always 12 (I'd argue for 13 but leaving out adding a Rifle for that last one!).
So to have them all evolve properly without average-easing things. Making it possibly:
- For Separate Mot. Pioneer Battalion + Motorized Divisions:
-> Mot. Engineer Squads 41 [1LMG] 22.06.1941->31.10.1943 - Panzer Division:
-> Mot. Engineer Squads 41 [1LMG] 22.06.1941->31.10.1941
-> Mot. Engineer Squads 41 (+) [2LMG] from 1.11.1941->31.10.1943 ...or name it "42" - Making both into one "line" [2LMG] starting from 1.11.1943
-> Mot. Engineer Squad 43 (+) [2LMG] from 1.11.1943
-> Mot. Engineer Squad 44 (+) [2LMG] (as done for normal Foot Pioneers I suppose)
The "Mot." would indicate the 12/13 Manpower and the "(+)" the 2nd LMG [when keeping the "(+)" also in the later Squad names].
Edit: Dates can be changed according to ingame TOE change dates to better fit (+/- 1 month).
Some Sources (Niehorster):
1.10.1937: https://forum.axishistory.com/viewtopic ... 0&t=220242
1.02.1941: http://www.niehorster.org/011_germany/4 ... n_0712.htm
1.11.1941: http://www.niehorster.org/011_germany/4 ... 11-41.html
1.11.1941: http://www.niehorster.org/011_germany/4 ... 11-41.html
1.11.1943: http://www.niehorster.org/011_germany/4 ... _0712.html
Just to name a few, they can all be found on http://www.niehorster.org/011_germany/__ge_index.htm (just check the "Military Organizations" Section). Note that he recreated some of them using his knowledge/other KSTNs.
He also has his Organizational Series you can find here of which the two "OS" marked pictures are from.