This is a very cool project. I know some people will give the old "why not just buy something newer and use that instead?" comment, but I totally get this.
In fact, I've been trying to get members of the retro-computing community to organize and collaborate on projects just like this. So that we can reverse engineer and document irreplaceable or hard/expensive/impractical to replace components like for example your regulator, or a Commodore PLA, and then work together to create open designs for replacements. Right now I'm focussing on the Commodore community, but in the future I would hope others would join in to organize for other platforms.
It's been exciting to see how many people are already doing projects like this. I'd just like to see us all centralize and organize a place to tie it all together while making use of existing resources like EEVblog, Lemon64, Lemon Amiga, etc.
Anyway, congrats on a fine looking project, and on reviving that 1541. Please let us know if you make the project available, even if it's as an OSHPark file and a BOM.