Guide on adding a new model, animation, and creature to HoMMV

In Maya 6.0, both the model and the skeleton appear as spheres, although previously, only the skeleton would turn into a sphere when transitioning from Maya 2009 to Maya 6.0. Most likely, I will have to redo everything from scratch in Maya 6.0, but I would like to know if it is possible to solve the problem without doing that.

Added after 22 minutes
Oh, no, the problem is that the model doesn't export at all. It simply isn't there for some reason.