NATO rails are used in the film industry to create video rigs, and in the defense industry to add accessories.
The strong points of those rails are the extreme precision and accuracy of the builds & the ease of use.
Those would be very useful as well outside of those industries.
I'm building a set of 3d printing rails and accessories to allow this technology to be more mainstream.
Also it's a lot of fun! (for me at least)
You can find my 3d models there:
https://cults3d.com/en/users/alainsanguinetti/3d-models
More to come..