This gallery shows some of the breakdowns for the workflows I chose on a selection of assets. I learned a lot on this project and developed some techniques I have since built on, here are a few that I thought were worth sharing hope you find them useful....and more importantly let me know if you have better ways of doing them I'm always keen to learn more 
Panning shot of the single asset placed and intersected
For the echo base modular corridor pieces the mesh work was overlaid with sculpted decals to create extra depth & layering
Here's the material in action
For the rain on the ground material I created a packed map to save on memory and with a bit of shader magic layered up the 3 masks to create rain splashes along with sweeping wind across the surface to breakup the repetitive rain hitting the floor
A close up of the material
A multi layered icey scraped wall material that had added depth from the parallax & refraction
Vertex blending options were also on the shader