Any home interior contractors on here?

What's worked in the past for me....

On the final wall you'll need to cope both ends which is very tricky. In the past i have spliced the final wall. You cope both ends and make a 45degree splice...keep shaving off of the miter until it fits snugly.....glue and nail. I usually consign the splice to the entrance wall.

Jim, I have 15' lengths of crown and each wall is about 11'6" right around in there. If I cope for the profile, do I need to miter the other end, or can I just butt one end on the wall, and miter and cope where the crowns come together?

I've only done some patch-in on crowns when we bought the house. The living room was a godaweful baby s*** green that had to go, so I pulled all the existing moldings. Some of the crowns broke as I was taking it down and thankfully there was some crown left from when the house was built.