When we shipped our avid storage servers out in work, we bought some very large knock off peli cases with the foam blocks and some ESD bubble wrap. Wrapped the disks individually in their hotwap trays and slotted the disks into cut outs made into the foam. This was for 3x 18 bay chassis, so not quite as large scale. IIRC, each resign case fit 16 disks comfortably, and the extra two were squeezed in the sides. It worked perfectly and everything survived the journey from Cardiff to Leeds. The process of cutting out and wrapping each individual disk was quite labour intensive. We also got the benefit of having the resin cases back afterwards to reuse for tranmsporting or shipping other bulky/delicate items again.