Are you looking for shelving the right size for bolts? I wrap most of my fabric on comic book boards but I do keep my larger(3yds+) on regular bolts. I found this bookcase at a thrift sore missing most of its shelves, and a light bulb went off. I had two shelves cut for the top half but my regular bolts fit on the lower half. You could put bolts on upper and lower parts of the bookcase by removing another shelf.
Cari