I had this idea awhile back and finally took care of it. I took a short section of 4x4, about 8" and cut in half on a 45. I just used my heap circular saw. Then I drilled some holes in it, a little over 1/4" and some 3/4" ones. The row of smaller holes is for top punches and te bigger holes are for the sizing dies. I've been casting for about ten years and only have a few sizing dies but at least thy are now stored better and easily accessible. Plus, I've got plenty of room to expand!!

blocks that lay flat inside a plastic drawer unit.

in the plastic tubes they came in, so's the lube don't dry out, however I did the same thing. I also put finishing nails up a 2x4 that holds up my bench and put my shellholders in sequence on them. I look at the chart them select the correct shellholder the first time.