I modify some elements for the moment in version 1.12.2 to be able to use it, in anticipation of updating it for the 1.13.2 when Forge will be functional.
For example some crafts were no longer possible. Now resolved.
Regarding the display in 3rd person view, we can see the player in front of the plane, but there is no back. what types of files need to be modified to solve this problem? (PS : I just noticed that the action bar is not displayed in back view either).