Do you think a custom one could be built, perhaps out of wood, that would be really small? Even smaller than the case you mentioned. I'd like there to really only be just enough room for the components. Maybe some of the components could stick out, to save space. Like the power supply and CPU cooler. Looking for the smallest form possible.
I'd take that Slinger case over the CR1080 any day, but I'd never spend $250+ on a case.
Sure, and tbh, neither would I. But he asked for the smallest possible ATX case, which the Cerberus X is(as far as I know). And it can still accept all full size components as well, depending on the config.
But even among more affordable cases, there are smaller ones than the CR1080, the Jonsbo U4(29.8L) has already been mentioned, will list some below.
There are affordable ones:
SilverStone Grandia GD09B/GD10B (26.8L/27.4L)
Thermaltake Core G3(23.6L)(only 2 pcie slots)
And even budget ones:
Raijintek Arcadia II(29.6L)
Kolink Inspire K1 RGB(25.11L)
And a bunch more generic looking ones.
There's also the Streacom F12C(25.9L), which is a really nice looking case. but its about as expensive as the Cerberus X.