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Mmm...depending on the exact period in the Marvel canon you're considering, an angry Hulk was, IIRC, *stronger* than Thor. The classic Hulk line is, "the madder Hulk gets, the stronger Hulk gets." And I'm positive the canon shows him going WAY over 50-ton lifts. I can't find the copies of the OHOTMU hero entries; looks like someone forced them to take marvelrpg.net down, because all you get right now is a 'this page is parked' with some random-ish links.

But you're also pointing out, as we've done, the conversion issues. Either Thor or Hulk would simply *smash* through a foot-thick stone wall...solid stone is listed as an Incredible-strength material, and even 2' thick only involves a single shift, up to Amazing...and Thor's Str is listed as Unearthly. (This is from the Advanced RPG rules, which have some specific stats as examples.) That's 2 categories higher, so I think doing so is *automatic*. In D&D nominally the wall has 360 hit points at 1' thick. The D&D system of +1 damage for every 2 points of Str, becomes ludicrous at these levels.

On the topic of Nukes, keep in mind that a Nuke would essentially be a 2,600ft radius Mass Disintegrate (40d6 damage with 5d6 damage on a Failed Fort save) and probably DC 30 or DC 35.

Not even close. Not even *remotely* in the ballpark. From:
http://www.fas.org/nuke/intro/nuke/effects.htm

50% of the energy is blast, which we can translate to a Force effect.
35% is thermal
15% is radiation, which might best be treated as akin to a Disintegrate, but IMO wouldn't have the 'save for trivial damage' aspect.

One *major* issue is, D&D simply does not model explosions at all. An explosion's effect decreases with range from the point of detonation. For example, from:
http://www.fas.org/nuke/intro/nuke/7906/790604.pdf (a 1979 paper on the effects of a nuclear weapon used against a civilian population)

at 4 miles out, from a 1 megaton warhead surface burst, the blast still creates 160 mph winds. Get hit by a stone doing 160 mph, and...ohh boy, are you in trouble. The paper gives the following:

Table 3.-Blast Effects of a 1-Mt Explosion 8,000 ft Above the Earth's Surface
.8 miles from ground zero: 20 psi overpressure, 470 mph winds; reinforced concrete structures are leveled.
3 miles from ground zero: 10 psi overpressure, 290 mph winds; most factories and commercial buildings are collapsed. Small wood-frame and brick
residences destroyed and distributed as debris
4.4 miles from ground zero: 5 psi overpressure, 160 mph winds; lightly constructed commercial buildings and typical residences are destroyed, heavier
construction is severely damaged
5.9 miles from ground zero: 95 mph winds; walls of typical steel-frame buildings are blown away: severe damage to residences. Winds sufficient to kill people in the open.
11 miles from ground zero: 35 mph winds; damage to structures, people endangered by flying glass and debris

Now, to be sure, most nukes today are 1/4 this size or so, but that just means we're talking 1/4 or 1/3 the radius. Say, then, that at 1/4 mile, we're talking the maximum effect...reinforced concrete structures have roughly 500 hit points per hex. (We can create a special rule that the damage being done, is *per hex*. If we don't, then the damage rating has to be absurdly high, because a large building would occupy several hundred hexes, and therefore have perhaps a million hit points total.) Still, we're talking 150d6 at this distance.

And...save? No. At least, not for the first few distances.

I apologize if I'm being a bit harsh, but I've just seen too many attempts to model, in game terms, a nuclear blast in ways that let PCs survive it...heck, even (almost) laugh it off. NO. Even a small atomic blast such as Hiroshima or Nagasaki, is *INCREDIBLY* devastating. Wikipedia has perhaps a more approachable article, which also talks about the damage from a small device, here:

http://en.wikipedia.org/w...ts_of_nuclear_explosions

So...if the PCs aren't WELL away from ground zero, and/or have major shelter...I just say...you're dead. Period. Don't care about level, don't care about defenses. You're just dead. If, for some reason, I need to model it, I'll have fire damage, force/physical damage, and the 'negative energy' damage...all separate, all scaling down with distance. But I probably won't even bother unless they're getting into areas where 'heavy construction is severely damaged'.