I'd flat out freak framing a wall .4064m oc. Hell, I don't even know what the diamonds work out to, 19" & some change.

Most of construction works in feet & inches. Cabinet makers are a bit slow and we function only in inches. I have to think for a second if someone says 13', 5-13/16", whereas I get it pretty quick when its 161-13/16".

How does it work in si? Do you use strictly meters? Or a combination of m and cm? What do you do if you have 62.5cm? Do you call it 5/8 of a meter, or .625 meters?