Next is lining up the bridge. If ever there was a 'measure 14 times, drill once' it's this!
First thing I did was to check the full movement of the bridge rollers from fully forward to fully back. Probably enough for a square-on positioning - but there's no point in even banking on that and so I will incorporate a modest bacward sweep to aid the intonation of the bass strings.
Then to position, I fitted a couple of strings, threaded through the stop tail to the outermost tuners and taped it into position. I could then slide the roller bridge under the strings and position it to scale length on the top E with the roller fully forward (intonation for the top E is usually relatively close to scale length but, if anything, will be a teen bit further back - it will never be shorter than scale). Then, once I'd positioned it so that the two strings were where I wanted them in relation to the fretboard sides, I could press the spike of a bradpoint drill in to mark the centre:
Then use a forstner for the bridge insert-holes:
And finally, with fingers crossed, hammer the inserts in and try it!
Big phew!