RLBPS had a brief fling with doing a range that included a massive, Kong-sized Primate (or, if you like, A "Primate of Extraordinary Size".) However, apparently things fell through, as the range ended rather quickly, with little comment..
That said, I do have the Reaper Ape mentioned here. I use him for my Gladiatorial Games (ok, that's the intent, I've been so snowed under with other projects that I've been neglecting the Arena lately). He is quite large, and would probably look the part. In 28mm, he's almost big enough to qualify as a "Mighty Joe Young."
-Doc