As my work has come out the kiln I was able to get the final measurements after their shrinkage. Both parts will now be 3D printed ready for the final product.
These are all the parts I purchased which I’ve used to measure all the dimensions.
https://theengineeringmindset.com/guide-to-lighting-and-power-cables/
Good website to choose the cord I need, decided to go for a two chord flex.