The Emerald series is a product established by Colossal Thrust for the under developed civilizations. The ones that have made contact but are far from advanced reliable travel, so the engineers of Colossal Thrust Corporations have created 3 very simple and basic ships to get this civilizations going.
Colosal Thrust provides no weapons and bare minimum softwear and other luxuries. That is the job of the purchaser to outfit it.
The Cruiser is for mainly personnel transportation. The Emerald Cargo is for large machines, or other goods. The Emerald Cruiser is much more suited for people, and is ready to defend itself just in case.
Top view: has a turtle look to it.
Thrusters: I honestly tried to build the ship around the thrusters. That idea came first then I tried to make something simple to fit them.