We had a trip away last weekend, so there was no chance to spend any time in the workshop. However, this weekend I managed to do another couple of ribs on the bowlback. I am definitely getting better at the process, but I still find it tricky. The key seems to be getting a really accurate shape when bending the ribs, and then marking the sides to be shaped carefully with a thin flexible metal straight edge fixed to the bent rib with small spring clamps.
The other thing is the glue... I have taken to squeezing some Titebond onto a piece of polythene and then folding this in half. I then drag the thin stringer through the glue inside the polythene to coat both sides of it at once and then trap this glue soaked strip between the existing bowl and the new rib before hammering in the tacks.
Four more ribs to go!