Talk to Mark Hartshorne at Pinnacle High performance Guns, he rechambers .38spl and .357mag guns to .38 Super. So does TK Customs. However, if you're interested in something like the S&W PC gun you pictured I think you'd be better off finding one, new or used, rather than having something built. You can also call Hamilton Bowen, he can probably make you a .38 Super using a blank cylinder, just be prepared to pay.
"If violent crime is to be curbed, it is only the intended victim who can do it. The felon does not fear the police, and he fears neither judge or jury. Therefore what he must be taught to fear is his victim." - LtCol Jeff Cooper