I think it would be fine to cope one end of a piece and miter the other end for the outside corner. Cut your coped end and get it fitting nice, then cut your miter. Sneak up on the miter cut and take tiny cuts until it fits right...No place for a tape measure!
Doing it the other way you're looking at coping both ends of the piece at the top of the drawing (or a scarf joint in the middle)...Not fun.
Don't forget to glue those outside corners!
Doing it the other way you're looking at coping both ends of the piece at the top of the drawing (or a scarf joint in the middle)...Not fun.
Don't forget to glue those outside corners!