Its hard to understand the strange relationship between the Trandal and his Overmind tech! I was responsible for the design, modeling, and look development for this guy in Star Control: Origins. The tutorial for the lookdev concept for this guy can be found here: https://www.artstation.com/artwork/oOX3gm
The Trandal was modeled in Zbrush, 3D Coat was used for the retopo and unwrap, and it was textured in substance painter. Renders were done in Marmoset. Thanks for looking!