Ok oz, I have your blend file but was it the file you used to export to babylon? You are right the armature is very small - but I see no indications that you tried to scale it. Anyway I used it regardless.   First though I did some clean up so that the scene was easier to work with.   1. Switched the view type to "Ortho" and then 3d window view to "Front". 2. Selected the Armature, and Properties Panel-> Armature Tab->Display->Xray. The bones now show through the mesh.   Here is my work