I have a fixed bridge, although I think I will be receiving an adjustable one from Adam as I emailed him yesterday about the measurements.
As for the measurements, I went and bought an accurate straight edge as I didn’t trust the tape measure I was using. Nut to centre of 12th is 312.5 mm and 12th to bridge is between 314 and 317mm depending on which of the fixed points you use, (see pic) so I reckon it’s close enough for jazz. Obviously the adjustable tail piece will make this even better.