Hello.
I think "DAN 4A" is very expensive.
And It need a "SFX" power supply.
There are 1009 results for "computer case" on Thingiverse.
Perhaps more with different search terms.
EM-shielding is not a problem?
EM shielding by glueing aluminium foil at the inner surfaces?
If you have a radio amateur as a neighbor, and that bothers him, he can notify the authority for radio, and u get in trouble.
The operation of the device is immediately prohibited by the officials.
A PC user had left his PC open, and a neighbor (radio amateur) called the authority.
True story from Germany.
What would be the printing costs of a Case only?
With own 3D printer, or a 3D printer in the city library (free usable)...
"finish quality"?
Not every person needs a "perfect" smooth etc. surface.
Also not faked metal etc..
My wish, the smallest possible case for ATX power supply, 980Ti (and similar long).
And perhaps a "ruggedized" version with a handle.
Like this: