Duplicate the data in series on "z" direction

Hey there.
I am new in grasshopper, I want to duplicate the entire truss on z direction, I used duplicate component and series component to achieve what i want, But i guess there is flaw in my algorithm that’s why i am not getting the result as expected.
(please have reference image and .gh file)
Best Regards
Huzefa Malik

Truss.gh (10.7 KB)

Truss_rev1.gh (10.3 KB)