Upper_Krust
Legend
Hey there Khisanth! 
But thats the point, it is that strong. Megasaurs are as proportionally strong as humans.
I disagree. Godzilla is going to be as proportionally strong as a human scaled up. He's not going to be weaker.
While an ant can lift 50 times its own body weight, while a human struggles to lift its own body weight, Godzilla will also be able to lift his own bodyweight or slightly better (and we have seen him lift and throw other Megasaurs).
I think you may be adding a layer of confusion to something that doesn't need anymore math applied.
If its 10 times bigger then its 1000 times heavier, but only 100 times as strong (normally).
Zilla is probably 16 times bigger which means its 4096 times heavier (about 25,000 tons), but only 256 times stronger.
Godzilla is about 8000 times heavier than a T-Rex but is also at least 8000 times stronger.
Basically Zilla's bones, muscle and tissue need to be 16 times stronger than a T-Rex. I'll need to go back over Mike Wong's initial artical to determine exactly how much stress they should support and what materials they are equal to.
It couldn't support its own weight because of the stress put upon its bones. But that assumes its bones are not super-strong, which they obviously need to be.
Which they aren't for Classic Godzilla, which tells us his bones are tougher than steel.
I think its possible, but probably not as a biped.

Khisanth the Ancient said:But most of that strength just goes into supporting its body. It won't be that much stronger *functionally* - won't be able to *apply* that much strength.
But thats the point, it is that strong. Megasaurs are as proportionally strong as humans.
Smaller things are stronger for their size. Ants can lift 50 times their own body weight - but they're actually pretty weak. A human scaled down to ant-size could lift *more* than that; an ant scaled up to human-size would be too weak to move, or close to it - it would need major redesign to survive at even cat-size, much less man-size.
Godzilla is going to be weaker proportionallythan a T. rex.
I disagree. Godzilla is going to be as proportionally strong as a human scaled up. He's not going to be weaker.
While an ant can lift 50 times its own body weight, while a human struggles to lift its own body weight, Godzilla will also be able to lift his own bodyweight or slightly better (and we have seen him lift and throw other Megasaurs).
Also, I'd say your Dire templates' HD increases (x2 / size category) are correct for Dire-type creatures, which are supposed to be not just bigger but nastier/tougher, but not for generic size increases. A creature's HD shouldn't go up with size quite that easily. That's the equivalent of an increase in HD proportional to the increase in linear dimension (both double each size category). The MM/SRD porpoise is 4 to 6 feet long and has 2 HD. A whale 100 feet long, x20 times longer, shouldn't really have 40 HD - realistically, the biggest whales probably shouldn't have more than 15 HD, probably less; they really were fairly easy to kill. A 40 HD whale would make whaling nearly impossible.
For non-Dire size increasing, I'd say x1.75/size category, rounded up - so a Colossal whale comes out as 19 HD. Since the tail isn't supposed to be included in determining the size category, a Colossal whale's pretty huge, so that's acceptable.
With that rule...
a Colossal lion = 26-27 HD
a Gargantuan rhinoceros = 24-25 HD
a Colossal rhinoceros = 42-43 HD
a Gargantuan elephant = 19-20 HD
a Colossal elephant = 33-34 HD
a Titanic elephant = 58-59 HD
a Macro-Diminutive brown bear = 172-173 HD
...which all sound reasonable.
I think you may be adding a layer of confusion to something that doesn't need anymore math applied.

--- (Godzilla biomechanics stuff, ignore if you don't care about it) ---
The 500 tons thing just might be plausible, let's see. If one were to go straightforwardly from a 6 ton T-rex, a 500 ton T-rex would be cube root of (500/6) = 4.36 times larger in linear dimensions.
But AmeriGodzilla isn't built like a T-rex; a 60 meter tall T-rex would be about 150 meters long, and I don't think AmeriGodzilla is. It's probably more like 6 times larger in linear dimensions, adjusted for the different shape. (If you ignore the really tall back spikes, which are not going to weigh much, it's probably skinnier than a big T-rex would be, anyway.) So a 6x linear size T-rex will be 1296 tons. Reducing it to 500 tons gives AmeriGodzilla a density of 0.385 - insanely low, but maybe possible if AmeriGodzilla has a crazy air sac system (like a bird's) and highly pneumatized bones. (As far as I know, the lowest suggested for any real-world critter is a little above 0.5 - some pterosaurs may have been that air-filled.)
If its 10 times bigger then its 1000 times heavier, but only 100 times as strong (normally).
Zilla is probably 16 times bigger which means its 4096 times heavier (about 25,000 tons), but only 256 times stronger.
Godzilla is about 8000 times heavier than a T-Rex but is also at least 8000 times stronger.
Basically Zilla's bones, muscle and tissue need to be 16 times stronger than a T-Rex. I'll need to go back over Mike Wong's initial artical to determine exactly how much stress they should support and what materials they are equal to.
The interesting question is - could a 500 ton biped walk? I'm not sure.
This study's powerpoint (by an actual paleontologist!) suggests that a 10,000 ton Godzilla would not be able to support its weight, even standing.
It couldn't support its own weight because of the stress put upon its bones. But that assumes its bones are not super-strong, which they obviously need to be.
But a 500 ton G. is a different matter. Using those methods, if 500 ton AmeriZilla had articular area of 4 square meters per leg (seems quite reasonable, those legs are huge), the stress is actually less than on a big sauropod dinosaur. The trick is allometric scaling - the legs need to be ridiculously huge, bigger than AmeriZilla's even, in proportion to the body.
Which they aren't for Classic Godzilla, which tells us his bones are tougher than steel.
So, contra Mike Wong, I'm not willing to rule out a 500 ton biped as impossible in principle as a product of normal Earth biology. Dinosaurs didn't evolve one in reality - but given 100 million years or so of continual evolutionary pressure to get bigger, and near-infinite food supplies, the necessary biomechanical innovations are probably plausible.
I think its possible, but probably not as a biped.