Actually, you can read some of the STA numbers on the original drawing.
Those, combined with the knowledge that the window frame pitch on the 777 is 21 inches, are enough to work out most of the intermediate stations.
The only thing you have to be careful about is that the centre section of the -300 has frames with compound STA numbers so that the rear fuselage on both variants can use the same STA values (from 1601 and up).