787 Blender Model v1.0
This is a model of the 787 with all doors and rudders but without engines, wings or elevators. You can easily modify those files with a 2D paint application. I have also included a blank template file, the Blender gltf importer, and a link to a tutorial for those who need it. However, you should only need to use 2D painters for the engines and to change the files to DDS.
When you open blender delete the box (right-click, delete) and use the importer to open the gltf file. you may have to look around for the 787 when you open it.
I hope this makes it easier for you to make liveries!