Having neglected the blog for some time now, a brief continuation.
Chalk-fitting the bass-bar blank. The temporary studs help in placing the bar, so that each time it goes back to the same position. They also provide support, to keep the bar vertical, when gluing.
Once the trimming to fit is done, the bar is glued in with fresh hide glue. I don't have a very sophisticated clamping system, but it seems to work.
Letting the glue set overnight, I then remove the clamps, clean away the temporary studs, and then lay-out heights.
Sketch in the curve of the bass bar and start removing overhead.