Doc the walls are coming along excellent mate and I'm really looking forward to seeing more.
As per your question about the Plaster and woodglue mix, the reason I use this mix is for two reasons.
1: the glue helps the plaster adhere better to the surface and once dry it become stronger.
2: the glue actually helps with plaster not cracking over time, it actually stretches in the heat and shrinks in the cold to a certain degree.
Ron