I think it will work fine. I'd make the linear bearings with 6 mm walls and the camera platform and support 12 mm. That then would easily support 2 kg.
Once you construct it in 3D post up the details so we can make a final judgment to be sure.
It always was. It always was because somethingness cannot spawn from nothingness. And in the was of the past there is the forever of the now. Only now. Only now and nothing new, for anything new would add to the infinite, yet there can only be one infinite. Only one. The universe is only becoming something new in the delusion of our minds. This delusion that makes life worth living in our perceived universe becoming.