Unity 3D Alienish Platform

I'm making a homage to Metroid in Unity 3D. I'm looking to have a "platform" built ( however you wanna do it ) but sent to me as a Unity 3D prefab. Looking for a metal-ish grate platform with "blocks" like the grate Samus is standing on ( screenshot ). I'd like it to be low poly ( 6 sides ) with a repeating texture on a cube object "platform" like the one in the screenshot. The most important part of this will be the texture bump spec map. I want it to be a high resolution representation of the platform that Samus is standing on ( screenshot ).