Given that it's a pretty niche thing, a link or post context wouldn't hurt.

That being said, I would assume that like most DIY things, part of the purpose of it is the creative journey that leads you to assembling yours. You learn things along the way and have an interesting artifact to show for it once you're done.

They shine in niche use-cases:

portable hacking / networking tools distraction-free coding or writing offline or low-power environments