Match the FCM 36
The attention on the FCM 36 was no coincidence. Yes, the tank was the heaviest and most expensive out of all the participants, but it had two important advantages. One was the diesel engine, more economical and suitable for use in a tank. The other was even more important. The FCM tank was built entirely from rolled plates held together by welding. Other French medium and light tanks used cast hulls and turrets, assembled with rivets on frames.
Trials of the Renault R35 in June of 1937 illustrated the difference between cast and welded parts. According to the second edition of the technical requirements, the new light tanks must have armour that completely protects them from the 25 mm autocannon. In theory, 40 mm should have been enough to provide this. In practice, out of 22 25 mm shells fired from 0-1000 meters, 13 penetrated the armour. The case with 37 mm guns was even worse: 14 penetrations out of 18. It is not surprising that the FCM 36 was viewed with even more interest after that test. The idea of using its turret instead of the APX R on the Renault and Hotchkiss light tanks was also proposed.