Mixing pure lime plaster

Talking in another thread about AI recompiling existing contents I decided to create more core contents and post some images from today's plaster making as we are finishing plastering our house inside.

I use plaster sand from Home Depot purchased in 1000 lbs sacks ($36) and LHoist high calcium lime (Type N) ($27). I have prepared the putty 4 days ago in a blue food grade barrel using 4 bags of lime, around 90 l of water and Bosch roto-hammer with SDS mixing paddle attachment to mix it all. It's more convenient to mix large amount at once in a large barrel - there is less scraping, remixing and splashing and it takes 3 times less time as compared to using multiple 5 gal buckets that also need lids. 1 bag of lime makes 2 such buckets of putty, so I would need 8 of them. 4 bags of lime filled 3/4 of the barrel with putty, so it should be enough for 450 kg of sand from the sack. Such amount of materials should cover 34 m2 of the wall area at the 10 mm of thickness.

The image descriptions explain the steps.
I'm using empirically determined ratio of 2.2 volumetric parts of sand to 1 volume of lime putty.
If the mix is too stiff, some water should be added, but a little bit at a time.
I use organic rice straw that I cut with heavy duty scissors to 3-8 cm length.
For the wheelbarrow batch I'm using 1.5 of small 2 gal bucket, so 3 gallons.
I have calculated to what height I should fill the bucket with lime to get 2.2 less lime putty than 3 gal of sand. I marked this height with regular pencil on both interior sides of the bucket and it survives multiple loads if putty.