Yes indeed, it was a lot of work. It took a whole school semester of 10 weeks.
The details in the 4th and 5th picture are sketches made by hand. And I gave them a color in Photoshop.
The 3d details below these sketches are rendered in Vray. The materials are named in indesign.
Here is a simple interior render I made this morning for a presentation tomorrow. I ain't 100% satisfied with it, but the purpose of this render is to show how the steelwork was formed and to understand the details better.