If not too late, I recommend increasing the size of the rods to 3/4 inch. I've built two of these racks. The first was built with MDF and the second was constructed with slate (check my system). The MDF rack would wobble some if the nuts weren't tight while the slate rack is "rock" solid. Although the 5/8 inch rods provide enough strength I regret not using 3/4 inch rods.
