Riotoro call this their 'convertible' PC case. it comes flat packed, and you get the instructions online to follow. As Leo explains, this IKEA style of building a case wasn't all smooth sailing.
Browse the best PC cases, see what you like ... However, you need to make your own choices, as design preferences are highly ...
Here's another area where going your own way has its benefits: the design of your new PC ... you get to choose the case and size of the PC as well as everything else. Eschew the boring boxes ...