Scotley
Hero
A fighter/rogue MC in 4e wouldn't usually be very effective.
A better idea would be to divorce Rogash's concept from his mechanics for a moment, and ask, "What makes Rogash, Rogash?"
Then we can find a class or class combo in 4e that suits that concept. Classes don't always (or even often) translate over on a 1 to 1 basis.
Edit - Having looked over the sheet in the RG, Rogash is a rogue first, who looks like he took fighter levels for the proficiencies and the bonus feats. In 4e terms he'd be a Brutal Rogue, I think...a rogue build that emphasizes hard hitting rather than fancy footwork. Dex is still the primary stat (as it is for Rogash), but Str comes in second.
Yeah, he was really built from the concept of a behind the lines warrior. Just enough stealth and speed to get in and then enough oomph to kick some tail. A brutal rogue might be the way to go, but am I going to be limited to light blades and slings for most of the powers? That sort of tosses out his axe, bow and pole arm. Where are the hybrid rules? Dragon? I've got most of them, nearly all the books but not access to the compendium and character builder.