Yes, Steve is correct. And to add to this:
The LiNC80 is 150x180mm. Mounting holes (3.2mm) are provided at each corner, set 10mm in from each side (making a 130x160mm pattern). Two additional mounting holes are placed at 80mm offset from the top left corner.
The Z50Bus prototyping card is 100x100mm, the bus is centered on the card.
The Z50Bus Backplane is 100x122mm, mounting holes are in each corner, 10mm in from each side, plus a pair located on the middle (61mm from "left" edge). Space for the end-connectors need to be accounted for when laying out a case.
"Top/bottom/left/right" is given relative to the printing direction of the main silkscreen components.