I am impressed how you try to cover everything.
I hope it is not too OT if I post this picture of a 1937 prototype that I had never seen before

Ialso don't know if this information is correct
"This AFV was produced in Spain, in the Sestao Naval Yards, during 1937. The Spanish Army accepted the prototype, but problems with the manufacture of armoured steel plates stopped this proyect. Italian advisors were present during the design phase, ant it is inspired both by the L33 and the Pz I. "