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.
“Never give in. Never give in. Never, never, never, never—in nothing, great or small, large or petty—never give in, except to convictions of honour and good sense. Never yield to force. Never yield to the apparently overwhelming might of the enemy.”