I've seen atleast one terran mech vs toss, a funny ghost thor build. Pretty sure he was european but can't remember who it was.
There are some cute Thor/Banshee builds that are viable as 2 base all-ins basically. But as a solid macro game Mech is not really very good againtst toss. I've seen Beastyqt do it on stream before though (but only on shakuras, which is a pretty baller map for turtling terrans (and those little high ground areas are somewhat good spots for tanks against chargelots)
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