B'Struder with M6 mounting tabs

I wanted to mount three of the amazing B'Struders horizontally on my delta with 30x30mm extrusion.
The t-nuts I had at hand have M6 threads, so I added a couple of "ears" with 6mm holes to the B'Struder body.
Originally I intended to use OpenSCAD for the new thing, but I was never able to render the file in OpenSCAD without error when importing the original .stl file - seems to be some issue with the file, and OpenSCAD is VERY picky with what can be imported as stl. Also tried to fix it in Ne