Wiktionary
rough out
vb. (context idiomatic transitive English) to produce (a plan, diagram etc.) in rough
WordNet
Usage examples of "rough out".
The Major found out that Newt was good at breaking horses and asked Call if he would mind leaving the boy at the fort for a few weeks to rough out the new string of horses.
But consider: in the world of music many composers, when they have completed an opera, rough out the plan of the overture and give it to some trusted, gifted assistant, who writes it so much in the style of the master that experts cannot tell one from t'other.
She gave Brenna a pointed look as she reached for the clippers to rough out the scissors cut.