I'm definitely behind this idea and will contribute as much as I can.
I do think, however, we should try to come up with character conversions that really overall fit the characters they are intended to represent and not just match up to the specific perceptions and concepts based on one writer's or another's version. We can always add specific variations based on period and/or writer afterwards.
Also, we shouldn't try to force characters into a specific Power Level, min/maxing Power Point allocations to achieve the closest match to the character within a specific PL. If people want to tone down (or up) characters to suit their own campaigns, then they can do so afterwards.
I'd only recently gotten a copy of Chris's benchmarks (thanks, Chris), but I've taken the time to look them over thoroughly enough to believe accurate Marvel character conversions should be easy --as long as people are willing to be helpful by collectively making decisions about the more questionable abilities of some characters...
...for example, I recently questioned someone assigning a strength to the Thing that would give him a Heavy Load of 100 tons because the old MSHRPG rated the Thing's lifting capacity at around 75 tons. It was noted that the Thing has consistently been able to press 100 tons, which I wasn't really aware of... my first impulse was to argue that by the MSHRPG rules that a 100 ton lift was possible for the Thing by making a Red FEAT strength check, but if he was really lifting 100 tons consistently in the comics it should be set at around 100 tons.
So, people will need to make an effort and contribute their knowledge of characters where needed to make a set of standard Marvel characters work.
So... with whom do we start?