Awesome post! Always happy to see more committed infrastructure. We made this move a while back and were really happy with the results. Check out Packer for AMI builds and you're all set.
One suggestion re: TF files is to keep each service in a separate TF file/state and keep all your state files on S3 that way if someone does an apply it's always consistent. Keeping things separated means that you don't have to worry about hitting other services when you do an apply
One suggestion re: TF files is to keep each service in a separate TF file/state and keep all your state files on S3 that way if someone does an apply it's always consistent. Keeping things separated means that you don't have to worry about hitting other services when you do an apply