Wrong buildup Filament change unit?

I am new here. I have printed and build up the filament changer unit.

But what i saw Chris Basement video, i think i have wrong build this.

Can anyone look this pic.

I have reused a steppers from a offwrited old Ánet A8+ printer.

Can anyone a 3d drawings or somethings to show how the unit build up and where the steppers posited and the selector-cog where the points at.. like points to the connector or points to back.

And how sliders posited ?

I am deaf and low vision a video is much to speedy for me, thats i posible wrong with building the unit.

Thanks and Greetings with love, Jobbie from the Netherlands.