This substance is heavily based on the HR Giger painting 'Biomechanics Landscape XIX'.
http://artmight.com/Artists/H.R.Giger/Paintings/hr-giger-landscape-XIX-8404p.html
I filled in the missing areas with my own ideas and went for a slightly darker texture theme that in a game would be fitting for a creepy abandoned alien structure or something along those lines. Everything is 100% Substance Designer. For the cables i used Ilija Kuzmichev's Curve Drawing System and suzukiMY's Bezier Curve Editor.