I have had a lot of luck using the Plasma desktop environment (on Arch). Super customizable, to the level of hyper specificity you've described (down to the pix

I have had a lot of luck using the Plasma desktop environment (on Arch). Super customizable, to the level of hyper specificity you've described (down to the pixel, sometimes), and is mostly intuitive how to make these customizations. My local machine basically looks/runs like Windows 10, but with the KDE Plasma logo in the corner instead of Microsoft Windows. I have a similar setup using Cosmic on Pop_OS!