Puget Systems did a pretty exhaustive article about vertical cooling cases, including this specific case. They tested the case in multiple orientations, and also tested it against more traditional front-to-back style case layout.
Their conclusion was that the case is great at cooling, but it isn't because of the vertical layout. It's more that Silverstone did a hell of a job with the design, and they packed those 3 massive 180mm Air Penetrator fans in the bottom for intake.
It was and still is one of the top cooling cases on the market, but the inverted orientation and convection effect doesn't really have anything to do with it. That's more of a gimmick.
It's more from the unique nature of the 3 massive 180mm intake fans, which can provide pretty much unmatched levels of airflow into the case, and that cool intake air is being blow directly onto the hottest components and then immediately exhausted out the top. It's a pretty brilliant design in that there isn't really any space for pockets of hot air to accumulate.
It's an awesome case. You could still find them for sale new on Amazon up until a year or two ago, I wish I would've picked one up at the time, now you can only find them used on Ebay.
The only thing it's really missing, functionally, from modern cases is updated USB port connectivity, but you can always pick up a 5.25 inch device with USB C, 3.1 etc ports.
Silverstone actually still makes and sells those 180mm fans just for these cases.
Flip your pc so you get better intake?
The FT02 airflow path is as perfect today as it always was.
There is no better air cooling case, not even a decade
after it was introduced.
Oh didn’t see that the bottom had an intake space.
It's a crappy picture, look up some reviews of the FT02, it's missing a lot of nice stuff modern cases have, but
it was a heck of a design. I'd love to buy something new in a way but none of them so far are enough to motivate me