It may be backwards compatible, but that doesn't mean you don't have a bunch of work in front of you!

For every add-on plane, I have to:

Change the "render_3d_window=1" to "render_3d_window=0"

Change almost ALL of the ui_tags to include ui_createdby and ui_type/role and create ui-tags for planes that didn't have any.  Then move the ui_variation tag to the end of ui_type to differentiate between the textures.

Create a thumbnail for each plane.

Sort out planes with duplicate titles

For well over 100 planes, this is a BUNCH of work...