You'll have to forgive me if this idea was posted somewhere already. I looked and didn't have much luck finding it.
There needs to be a way to save multiple (even a max of 3 would be helpful) base layouts. I can't tell you how many times I've had my village set up one way and then decide to make a change to see if it's any better and come to find out that it's worse and then have no idea how to replicate what I previously had. If you had 3 spots available to save village layouts you could then pick and choose your layout based on your needs (farming, trophies, etc) and you could also make it an option to select one for the clan wars and be able to modify or even overwrite previously saved villages. I think it would be a great addition to the game.

