Quite the concept, eh ? Nicely done. A couple of bugs though:
As for Colossus, his Metallurgy skill is also giving Radiation Resistance. According to your description it was only supposed to give resistance to Elemental, Mental and Energy. The description of Energy Resistance is always at "0%", regardless that, the effects still apply.
You could remove Siberian Express and put something else. This power is just really bad from default. I never liked this power haha Btw, it's not a bug, just a suggestion xD
As for Bishop, his Power Trip doesn't work, neither does his description when you put points in it.
I just thought you'd like a feedback. Thanks for the great boosters!