I’m remodeling a customer’s bathroom and discovered that they way that two adjacent bathrooms shared their plumbing was not only incorrect, it was against code. I was able to fix that problem, but it involved taking down part of a curved wall. Repairing drywall can be tricky, but doing this on a curved surface adds additional challenges. I used a thinner piece of drywall that I could curve and a template to finish the job. See photos below.

Here you can see the space that needed repair.
This is the first round. You can see the plywood template that I made to ensure that the curve was correct.
The template in action.
Second round of finishing.
Final round of finishing. Now on to priming and painting. No one will ever know that the wall had been repaired.