That's an interesting Nessie, Roger... too bad it's soft vinyl! I don't like soft material for my figures.
Neptune, I don'nt know of any off the top of my head, besides the Safari Cryptozoology toob Nessie. But have you checked Etsy or another artists' shopfront website? Or thought of commissioning figures from an artist? I made a Nessie head once, but am unfamiliar with the water horse figure you mentioned and am not a good artist myself. Maybe an artist here could customize existing figures to fit your wants also.