Hydrated type-s lime soaked in water: 2 parts.
Mortar sand: 8 parts.
Halfway through and it still looks/feels like dry sand, so I'll add more water!
Done mixing... I think I added a tiny bit more water after this, just because it was so much easier to apply when on the wet side.
It took three batches that size to cover this portion, which is about 30% of a wall that is 12'x 12'x 12'. The plain straw area needs way more plaster than the straw covered by the chicken wire.