2nd question : is there a way to set only outside faces render, as I want to add a outline style to my 3D models (by duplicating the meshes, lil' scale, and black texture), but for this to work I have to be able to set visible only outside of faces textures
For the my 2nd question, the outline I try to get, this is how I'm doing it in Blockbench :
I duplicate every meshes, I do a little rescale and then I paint in black the backface of the entire duplicated meshes.
In Blockbench, to get this result I have to specify that I want the preview to render only outside of faces : 
But when I import this model with the outline in Construct, It renders Outside AND Inside faces :
Sorry again if I'm unclear, I'm doing my best ^^'
And thanks again for your help !