This is the sort of word that William F Buckley would use, I think. Useful (it cuts a two or three word phrase down to a single word), precise and obscure. It’s the sort of word he would use, one would look up and think, “Gee, I wish I had used that.”
abbozzo
A rough drawing or sketch (for a portrait, etc.); an outline or draft (of a speech, essay, etc.).
Neh 