There's only one player I've seen that uses a mech-focused TvP build - GoOdy. The general look of his build is some form of aggression (Reaper, Marauder, or Banshee) into an expansion. He then gets lots of Pre-igniter Hellions and Tanks as part of his main army. It's kind of like Brood War TvP, but with less mines and more Vulture drops.
Here's a replay pack featuring him against players such as NightEnd, Adelscott, MaNa, and Hasu:
GoOdy Mech TvP Replay Pack
My questions to all the Terran players are:
Why don't people use this style? GoOdy seems to have decent success with it. Does it have some inherent flaw that makes it inferior to MMM? How does it hold up late-game in comparison to MMM?