Once you reach the point of being able to build The Space Elevator, it will unlock new Tiers which are essential to the progression to your factory. All Space Elevator Milestones have to be completed by manufacturing the required parts, you cannot hand craft the parts for the unlocks
The first stage of this process requires the following to unlock Tiers 3 & 4:
- 50 Smart Plating
So lets get to it shall we!
Tier 3 & 4