Custom hot end

I’ve got an Ender3 and am looking at upgrading my hot end. But wanting to be extra extra, ive been toying with the idea of modelling and building my own, CNC’d from aluminum. Has anyone tried anything like this before? Id love to take a look at anything people have tried to sort of kickstart the thinking process

Yes i know im making this way more complicated that it needs to be, because its fun!!