Almost forgot: I actually came here to say that as someone who downsized for multiple reasons, but primarily to be able to travel with my computer, it was important to me to find a protective case that I could easily carry -- and I finally have.
Carrying cases
for full PC towers are too big, so the N-ATX would bump around inside one of those. Meanwhile, cases for laptops, even larger waterproof/dustproof/shockproof hard cases, are made with the wrong "aspect ratio," since laptops are approximately 16:9 whereas the N-ATX is more square at ~16:15. I had to get creative with what kind of case I was looking for, and after a lot of looking around noticed carrying cases... for dual monitors. They're tall enough for the height and thick enough for the width, and just leave extra space on the depth (usually ~24" as compared to ~16" on the N-ATX).
I ended up going with this , which fits and offers nice padding on all sides while looking decent and allowing carrying over the shoulder.
I've traveled with the case once in a suitcase, but the next time I transport the case I'll be using this and hope it'll be a lot easier!
I've also got some vague thoughts about a handle casemod, maybe made from leather?
@riba2233 I don't know what thoughts you may have had at any point about something like this and if there's any better/worse mounting points you could think of.