Okay so I basically want this case with the option of wall-mounting, but to buy from Protocase would be like $400 for 1 and $500 for 2. Not especially doable for what amounts to housing a 120VAC to 12VDC 12A converter with an IEC input connector, a fuse block, and a car accessory socket and Power Pole connectors for the outputs.
Any recommendations on how to do this relatively cheaply in a way that won't break every time I plug or unplug something? Would 3D printing be enough? I already looked for pre-mades and I can't find any with a similar enough shape, and even if I went with one that's a bit bigger I'd still have to cut the holes for everything, which I don't really have anything for other than a drill and a reciprocating saw, not the best tools for the job.