You think think that a 5 foot 2 and 97 pound woman isn't small?
He is atleast 5 foot 8 and very powerfully built, he DOES dwarf her physically!!!
I think a 5'2"/97 lb woman is very small. My point being that I personally don't think Nick Nude dwarfs Melissa Doll which would make Nick Nude not a very large guy physically.
Pornstar wise, I think very powerfully built guys would be Shane Diesel, Sledgehammer, Lee Stone, Ted Hunter, Franco Roccoforte.
One level below them would be guys like Rocco Siffredi, Nacho Vidal, Mark Ashley, Manuel Ferrara...guys who are in very good shape yet are not extremely imposing physically.
Nick Nude is IMO not very tall(I think he's closer to 5'6 than 5'8) and probably weighs 145 - 155'ish lbs. I do not consider that a powerfully built person.
Brandon Iron would be a guy who is short and powerfully built and he is widely listed at being 5'6" tall and weighing 160 lbs. He seems a bit bigger than Nick Nude horizontally/build wise.
My point being Nick Nude is definitely hung, but both his and Melissa's small statures magnify the visual effect of his endowment.