Narrow 1U case for a home server?

Question

Iron

I'm building a home server. In the hallway for these purposes, a small cabinet 45 cm deep hid.
The main tasks are torrents, I2P, file storage and DLNA.
Haven't decided on a motherboard yet. I suppose to put something with passive cooling, for example Pentium J2900. By the way, if there are arguments against the passive in the closet - criticize pliz.
Accordingly, the requirements for the hull:
- One-unit
- Depth max. 25-30 cm
- Budget (preferably)
On the last requirement, I stumbled. It seems that the task is not solved for less than eight or ten thousand (this is the ProCase UM125FD plus their non-standard PSU). Maybe I'm looking in the wrong place?
What cases would you recommend for this task?
PS To simplify life, I was advised to take 2U, but this option is considered as a last resort.

Answer 1

1-unit: noisy, power supply = non-standard form factor, cost = like a wing from a steam locomotive, 25-30 cm a lot of performance and not enough iron, from the word at all.

Answer 2

In China, relatively inexpensive 1.5U 250mm cases appeared on ali that are suitable for mini-ITX boards with passive cooling.
I just hung a not deep locker for myself, I plan to have a server for ASRock J5005-ITX in 1U, it doesn’t seem to fit, but it should already be in 1.5U.