Waffle Structure Following Surface Normals

Hi, I am trying to make a Waffle Script to follow the normals of a certain surface, but they all end up going just on X Y or , is there anyway to edit this script to make it follow a normal?

I am using a Waffle Script which I found here, I fix most of the elements as they were outdated or non working, thought there are 3 items I haven't been able to replace, fix. Any help is appreciate it.

The problems are here circle on red.

https://www.dropbox.com/s/vzep7osyjitj1qx/Script.png?dl=0

Also I wanted to know how to change the script from a Fix world coordinate for the section cuts to a more flexible one which finds the center of the Object and subdivides it to both sides on X and Y equally.

And as for last if it was possible to this in any way to make the Y follow the curve of the object instead of just a Y cut.

Any help is appreciated and also if you could explain the change so I learn and know for the future.

Rhino Model: https://www.dropbox.com/s/qd8l556z5acn7sv/Chair%20Final.3dm?dl=0