https://www.raspberrypi.org/documentati ... /README.md
has the display dimensions.
I've measured the standoffs themselves, and they appear to be 12mm (plus the thread).
Overall I agree with the total height of 20mm as given by the likes of Pimoroni
, and Element 14
Screen Dimensions: 194mm x 110mm x 20mm (including standoffs)
(although the mechanical drawings show 192.96mm for the width of the lens)
The Pi2 max height is on the USB connectors, and is 18mm (confirmed from various posts around the web).
If you need more accurate measurements I'd suggest you buy the bits you need and measure it for yourself
(The standoffs could probably be reduced to 9mm without the boards actually touching, but that would be a customisation).
Software Engineer at Raspberry Pi Trading. Views expressed are still personal views.
I'm not interested in doing contracts for bespoke functionality - please don't ask.