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How much clearance is there between the bottom of the carriage and belt for the MK3?

I haven't put together my Bear Upgrade yet, just printing the parts for it now. I've been taking measurements and been toying with designing a Y-Carriage with tensioner built in like you, but one of my issues is determining how much I can add to the height of the part before it starts rubbing.

The issue I'm seeing is that your part comes in at 27.8mm, but comparing to my measurements, that's too tall and would result in rubbing. The most I can do is 25.5mm before I risk the belt rubbing.