I think 38mm is fine. To my experience with the Velka 3, there's not really a measurable difference between 37 and 47mm air coolers when both have direct access to fresh air. And while there are some that mentioned turbulence noise, I didn't encounter it. Looking at the case, there are still a 2-3mm left between the cooler and the side panels too even on the closest setting. Then again, the perforation on the side panels can probably impact noise too. For 65w cpu's 38mm is fine.
As for the gpu, there are also 198mm cards with two fans (like the Gigabyte 3060 Windforce OC 12G). But at the end of the day, all I need is one good model done right. It's true that small dual fanned gpu's are nice. Yet there's something satisfying in a sandwitch-style build where the mobo and the gpu are back-to-back and have the exact same length, especially if it saves some space too.
160w while runs a bit hotter yet it's still fine, while 110w has to be perfectly okay with a single fan.
However, there's a problem with this layout, that most of these cards (including 202mm dual fan versions) have their heatsink horizontally finned. So the air is going to get get pushed straight the psu or the flat front panel. It would be so awesome if ITX gpu's would be made with vertically finned heatsinks... I would be likely using an ITX gpu with vertical fins than a horizontally finned 210mm card, especially if the latter needs a bigger case.
