We've made an an easy to read guide for how to create your own nodes using Javascript if you feel so inclined for yourself, the community, or more. You can see the new guide here
Thanks @Sean Buildbox Do you know what software to use to edit FBX files compatible with Buildbox? They do not open with Blender.
I have Blender, but one FBX file did not open with it, must have been corrupted. I'll manage it, thanks