On Aug 9, 2022, at 9:14 AM, Ryan de Laplante via
cctalk <cctalk(a)classiccmp.org> wrote:
 I know this is not exactly what you are talking about, but attached is a picture of an
RK05 with a storage unit for holding platters just above.  I’m still hoping one will show
up on eBay someday. 
I remember those from DEC RSTS development.  BTW, attachments don't seem to work.
There were also DECtape holders suitable for rack-mounting as well.  Both were plastic; I
guess they could be 3D printed except that the size may be somewhat problematic.
The wire racks come in several flavors differing in pitch; I've seen versions for
RK05, RL01, and magtape.  All similar but the widths of the slots change to match
what's to be stored.
        paul