Why the 1 iteration for loops?
Why the two Index Arrays? It is just trying to fix the problem created by the For Loops on the original 1-D arrays.
Both of those things are creating 2-D arrays that are complicating things and can be eliminated.
You can take your 2 1-D arrays, use Build Array and right click to set "Concatenate Inputs".
If you do have a 2-D array, you can use Reshape Array to make it a 1 column by N row 2-D array.
