I've started posting scenarios that I use to test parts of EE. The repo is at https://github.com/oznogon/EmptyEpsilon-test-scenarios
The allobj scenario has one of each object in the game, and might be useful if you need to quickly find and copy a line of code to add a ship or object to your scenario. It also has a bunch of artifact objects that each use one of the unused 3D models for visual reference.
The turrettest scenario adds an Atlantis that uses turreted beam weapons instead of the default fixed beams. It also has GM functions that add AI Atlantis ships with different turret configurations in order to test how the AI behaves with turrets.
I'll keep adding test scenarios to this repo as I dig more into the scenario scripting system.