I did my own using a good ruler, centred the bridge between the f holes and the strings run niceley up the board, middle of the bridge feet centred on the notches, made sure the bridge sat up square to the body at 90 degrees, 105cm from the nut to the bridge slots.
I'm sure someone who knows what they are doing could improve it but it is playable, the Gedo basses are shipped with the bridge removed so you have to fit them anyway, took me a few goes to get it where it is now