Not bad, actually. I’d kind of like to see a more professionally engineered case like this, with proper mounting points for the hardware instead of zip ties. (Oh, and a more easily opened side panel.)
May have some dust issues, yes, but could potentially be cleaned with compressed air without even needing to open the case. And you really do get massive airflow potential. And it’s relatively lightweight!



For materials cost alone, mind you – not including any labor you hire out in constructing it, and not including the land to put it on.
(And I’m guessing that 25k doesn’t include any electrical, certainly not any HVAC, and maybe not even any indoor plumbing…)
Still, building codes and inspections aside, I think it could be a decent idea even in modern times to have mass-produced, mail-order house construction kits available. Trailer homes have kind of absorbed most of that niche, but they’re not as well insulated or as long-lasting as real houses.