I've put together a new article on the blog, showing my methods for effectively using Copper Foil throughout the control cavities. The example shows it being done to a lovely telecaster custom, but the same methods/rules would apply for any model of guitar, hope it helps!
https://www.homeoftone.co.uk/blogs/news/how-to-guide-shielding-and-wiring-a-72-telecaster-custom