3D model shoulder issues

Hello !

I've been using blockbench today and I am testing the custom armor models implementation.

The helmet model is ok and so is the texture.

My issues are with the chestplate. Especially with the arms.

1. As you can see in these pictures, the "inside" soulder textures are facing the sky instead of the player's body.
   So there is two possible issues : 
   1. the soulders cubes must be rotated
   2. the texture is not well positionned
   In both cases I think I did good because the blockbench model is ok 
    
2. The left shoulder is not well placed. As there is a texture issue, we can't see well but the left soulder is 2.0F too close to the player body.
   But again it render well in blockbench.
   (I can fix that by changing the value in the java file but it should not be that way...)

What is wrong ?

• Blockbench java export ?
• MCreator interpretation ?
• Do I do something bad ?

Thank you in advance for your help.

(PS: I know my textures are bad but this is still a test)