> Hi Dieter, perhaps you could manufacture this as a standalone unit

No. We will leave this option to Schneiders Buero/Berlin. We will not offer
a competitive product to their Steckbox.

If you want you could built a standalone version with the free rail cuts we
offer on our Sonderliste (remnants of the monster production). Simple use
one rail on top and one on the bottom. The depth of the A-183-1 (provided
that it will be released) is less than the rails.

Best wishes
Dieter Doepfer