I wouldnt bother with lime plaster and lime mortar. Use modern stuff. It is better. Unless you want to roast meat, then use 17th century devices.
Ye got your little film, looks good. The thing with lime plaster is it breathes and it is supposed to be better for stone buildings, better for damp etc, and this is modern day thinking apparently.
You should get an old pool table for out in the garden. You could build a little roof over it.
Ye, might do that in fact.