Build My Design for a WP Theme for Brand or Style Guides

I have been searching for a theme that I could use to create a simple (or extravagant?) style or brand guide for some of my identities.

You know. color palette, official fonts, logo usage rules and downloads, and more.

I know what I want! Yet I have no idea how to make a WP theme or customize the hell out of one to get the layout I want.

Anyone want to collaborate?

No one has done this as far as I can tell! Glad to give the financial side of things to the developer. You could set it up and sell the theme all you want. I just want the themes! I have two versions in mind, maybe options within the same theme package?