Like a lot of people in this thread I've been looking for this and weighing the sidearm as a potential option was well. I think however, the og sff case, the m1 is getting overlooked. It can provide what you are looking for with some interesting pros/cons vs the sidearm and c4.
Ncase is a proven case and good to see it's getting improvements, I just do not think it looks very pretty - maybe its the angled front panel & the front / IO.
For me I want a small & good looking case, Sidearm, C4 & Mjolnir seem to fit the bill but do not actually exist yet