Mini-itx case might be more called for?
I have an old e-machines mini-itx desktop case. Has an 80W psu, and a single 5.25" bay, mounted vertically behind a plastic door.
It's barely deep enough for a half-height expansion card.
(Mine is white, but basically this.)
http://www.barebonekit.net/emachines-el1331-0 … acel133105.aspx
It is mini-itx form factor, and has provision for 2 half-height cards, and one (vertically mounted) 5.25" drive. (3.5" hdd rack inside). There are aftermarket psus in this form factor.
For aftermarket, mini-itx gets you cases like this one.
https://www.amazon.com/SilverStone-Technology … yY2hfYXRm&psc=1
Bear in mind that mini-itx boards have smaller area footprints as well, and that a micro atx board might not physically fit.
Caveat emptor, do research before purchase, and all that.