A light-weight table/bearing assembly with a low part count.

[greybeard]

My cnc design requires a small, open-centred moving table design, approximately 4 inches wide and 12 inches long.

I've come up with this idea which may have been done before, but I've not seen it.
I hope the drawing is self explanatory, and it's open to simple variations.
Essentially I'm using a 4 inch length of 0.5 inch screw thread as a bolt to hold the sides of the trolley apart at each end instead of ends.
Each of the eight nuts has a threaded locking stud through one face, and carries a bearing, with a nylock nut holding the bearing in place.

The outer nuts/bearings are fixed in place, washered to allow the bearings to clear the table sides, and then the inner pair are screwed outwards against a spring washer. This allows a positive alignment to be made against the shafts, at the same time gripping the table sides. When finally adjusted, the spring washers are locked in place with epoxy or superglue.
The outer nuts can then be removed in the future, if necessary.

Any improvements, please ?