Moved to the Zoo Tycoon 2 Creativity Centre.
The link you supplied doesn't seem to work, but Panoweaver is simply so expensive I doubt it will change anything drastically. Additionally Panoweaver is a panorama creating software package, not an animal/model creating software, so I don't think that's really the kind of program we're looking for.
Plus even if we did have the correct software, creating animals from scratch will never be easy. 3D modelling and animating from scratch, never mind getting it to work in game, is something that takes many years of training and practice and it's unlikely that frankly amateur designers as you find on the Zoo Tycoon 2 fansites will ever be able to make anything of BF standard.