For the static part, it's probably simpler to use OBJ import. I was able to get it imported with the proper scale as glTF by applying the object scale to the geometry. Not sure why that's required though. Also the object is indeed pointing in the wrong direction when there is no armature. Another bug to look at.
Applying the transforms to the sail (making sure the armature and the geometry have the same origin) seem to work too.
Created an issue for it at https://github.com/superpowers/superpowers-game/issues/26