Collada export

Hi all,
i’ve been struggling for a while with collada export( i’ve tried better collada too…), my scene is very simple but i wonder if there is something wrong with it. When i export and reopen the .dae file in blender, the bones and the mesh are separated and their scale is…well…let’s say big…
If someone could help me, i’ll be eternally grateful…
Here is the .blend file.
Book-03-bones.blend (770 KB)