Fit the low and high E string tuners temporarily. Run some normal string through them, over the nut and to the respective bridge saddles. (I'd take the trem block off so you can lie it flat on the body).

Tension it and measure and hold the bridge at right spot to get the scale length correct and then use the strings running down each side of the fretboard as a guide work out the optimal postion. Mark the screw holes. Then line up your template with the holes you marked and presto.

Similar to this, different guitar, same principle.