Bonjour,
Here is some informations about left door of the Schneider Ca1 M2.T
http://pages14-18.mesdiscussions.net/pages1418/Pages-d-Histoire-Artillerie/Artillerie-Speciale-chars-d-assaut/artillerie-laterale-schneider-sujet_1249_1.htm
It's easy to see that Saumur's Schneider is not (today) really the bible !
Bonne lecture - Michel