I have a friend who would like me to make him some floating shelves. I have done these before, but his are considerably larger than i expected. I was thinking of using steel rods drilled into the studs and inserted and epoxied into the shelves (similar to using regular dowels). There would be a normal weight load put on the shelves (just decorations mostly). I would most likely be using 3/4 ply for the construction. Are there any problems i would likely encounter using this method or materials? Any suggestions you have would be appreciated. I have attached a drawing that has the sizes and 3D look of the shelves.