Need Help with Grasshopper

Hello I m new in grasshopper and im trying to make this shape


but instead i stuck with this column

here the Grasshopper file
Build.gh (31.9 KB)

Thanks in advance

The final solid bars are not made with Loft but Sweep

Build Edited v2.gh (120.0 KB)

thank you very much prety clear and for the GH file its solve the problem

thank you very much appreciate its solve this problem