I want to build a concrete shell structure (on my project class), similar to this Gallery of Shell building, and I want to know the thicknesses of this building’s walls. I tried to measure them from the section and I found 70-75 cm (on the thickest parts) and thats actually too thick for concrete but what do I know, Im just an architecture student.. Can someone help me with this, should I make my walls that thick ? My building is 3,2 meters tall and 7,5 meters wide, which is half of Gallery of Shell. Do this mean I can build my walls half as thick as its walls? I’ll be grateful to all the answers.