Woohoo something pretty and exciting arrived! Thanks @Homebrewandhacking !
You're very welcome.
For those who had their curiosity piqued...
It's a 212 page hardback.
https://www.drivethrurpg.com/en/publisher/21080/homebrew-and-hacking
(It has quite a lot of good stuff in there.
https://homebrewandhacking.com/2025/05/12/it-has-arrived/)
(If you'd like the free version for the first edition to get the idea, it's here
https://www.drivethrurpg.com/en/product/477307/homebrew-and-hacking-system-reference-documents)