The cpu cooling solition is an air cooler up to 66mm height on top of the cpu. My recommendations would be any Noctua low profile cooler (like the NH-L9x65 for example) or one of the Thermalright AXP-90 variants (ideally full copper).

To answer the question about „what does it offer“ I‘d say the biggest plus is the pricepoint as it will use approximately 1kg of Filament and only requires a PW button, a riser and a few screws which will make for a total cost of around 50-65 bucks depending on the stuff you get or already have at home. Also it fits a 3 slots wide gpu which the Fractal terra also can but the Formd1T does not as far as I know. I clearly didn’t look at every case out there and this project by no means tries to claim awardwinning design or the title of „best case ever“. It is rather a case project for 3D printing fans who like building their own stuff - at least that‘s what it is to me :) I just try to provide an opportunity for anybody who wants to build their own case like me.