Here the source file for creating a decal mod in unity. This included normal decal and wing decal exemple.

-!- PLEASE READ THIS BEFORE -!-

1- Open a new unity project
2- Import the SimplePlane Mod Tool asset INFO
3- Set your mod name
4- Import my asset in your project and have Fun! double click on

-!- HERE THE LINK -!-
Download

Hope that will help some people to understand simpleplanes modding :)