I have no idea if this counts, but there is the Bullet Points (http://en.wikipedia.org/wiki/Bullet_Points) limited series where Steve is... Iron Man.
Which seems to call for a crazy alternate reality cross, because the expression on Tony's face when he confronts an Iron Man imposter who reveals himself to be Steve would be HILARIOUS.
As for Tony, I have no idea, though seeing as how he lived and breathed tech from a young age, I'm sure he'd incorporate it into his crime-fighting activities. Maybe more along the lines of Batmobiles than armor?
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Which seems to call for a crazy alternate reality cross, because the expression on Tony's face when he confronts an Iron Man imposter who reveals himself to be Steve would be HILARIOUS.
As for Tony, I have no idea, though seeing as how he lived and breathed tech from a young age, I'm sure he'd incorporate it into his crime-fighting activities. Maybe more along the lines of Batmobiles than armor?