Thanks. Edited my own post to try covering that a bit. If the boards can't fit in one unit, then it's not ambiguity being a problem at all, but explicit clarity which covered this exact kind of situation, right? The quote I posted shows punin indicating he was not (at that time) able to produce a 400GH/s unit, and that 16 boards make up a unit.
What is "fit in one unit"? To use more than 16 boards requires 2+ m-boards. All 400 GH/s orders shipped with additional m-boards.