I was planning to build 2 floating shelves for our kitchen using solid red oak. The shelves will be 2 x 6 and about 4 feet long. My original plan was to bore a total of 4   1/2″ holes in the shelves to slide over 1/2″ pipe welded to a 1 1/2″ steel that will be screwed directly to the wall studs (drywall removed). This would be similar to the Blind Shelf rods sold by Lee Valley except they will be welded to a full length piece of steel to ensure it is well secured to the wall. I have everything cut and ready to go but now I’m wondering if the steel support system with cause issue with the wood expanding and contracting. Am I asking for trouble here? I thought about the torsion box design but I would rather use the solid wood if possible to match the rustic look of the flooring.

Edit. I found a picture of something very similar to what I’m building.