Abh mod/Bio Structure
The Bio Structure was introduced in 0.5.3 RC5. Among others it had been planned for a whole new faction. And was released along side those.
The Bio Structure is a biological structure that forms the basis for bio based bio armor and parts.
Build it like any structure. (Bio structure does not last and grows into bio armor. This feature has been implemented since inception but is still not available due to game bugs).