First, the bears
Next, the ostriches
Finally, here is a picture of the two with Pict riders on them. The bear mount will compress a little at molding, so the figure should fit on there very nicely. I am planning to do some pygmy types to go with the ostriches, though any of the various riders we do will work.
I think this will be a really fun project and will provide 15mm gamers with a lot of fun options for interesting and unique armies.