Ahahahahah, if you have played as much I did with this case you will know that the mm cannot be obtained! The TX is 125mm wide, so in any case, it stays ON the side struts.Yes, remove the bracket, and I'm thinking there's a bit of play on the motherboard mounting so maybe nudge it a little for an extra 1mm clearance? ?
One thing though, I never tried to REMOVE the side struts and having the radiator floating! With your version, the V1.1 is it possible to screw everything to the top panel! Lucky you!