It was meant as more of an idea than a finished design. Yes if the bracing became long and slender then it could resonate. They are all different lengths so they would have different resonant frequencies.

It is also the base frame so the bolting down fixings will help with damping.

Like I said it was more of a basic idea, I did quite a few different options and it started getting messy. So look at the bracing for layout and size accordingly.

I plan to build a similar heavy duty fixed gantry mill, better not mention that I want it to cut steel. He he