I don't know much about ODE (i.e. i've never used it), but i think it should already be possible to use it in combination with jPCT due to the way it works. Maybe i'll do something with it in the future, but i somehow dislike to use another native binding in addition to LWJGL. That's even more true for Cal3D. I would like to write my own skeletal animation stuff instead, but that is something that is not very high on my priority list either.