The Information is extracted from the original
"ui_0_4_top_placement – UI board component placement guide – top". 
I extracted the PCB and put this part into a CAD construction software. 
Please be aware, the measurement is performed on the extracted 
UI drawing only. Tolerances may occur. 
The board dimensions are really measured to 66mm x 186mm.

Greetings
Uwe DF2IR

The file location:
https://uk.groups.yahoo.com/neo/groups/M0NKA-mcHF/files/ui_0_4_top_placement-DIM002.pdf