terraform"
A flexible terraform module for creating an AWS ACM with a variable number of additional SANs. GitHub Repo
Here is a directory structure that I am using for Terraform that I think works pretty well. The quick and dirty of it is to think of your configurations in terms of a organizational and systems hierarchy, and to design your plans to support that hierarchy. Each tier depends on and builds upon the previous tier.
Terraform is an awesome tool. To make it more awesome though we have wrapped it with some custom Ruby ERB templating to generate our terraform configurations from Yaml configurations.