Please do consider slits instead of fixed HDD holes on the rear L-panelThe possibility of support for DC-ATX power supplies with external AC-DC adapters and 2 mm extra maximum graphics card length. There will not be any changes to existing features or the current appearance of the case yet.
Overclock? Nooo, I have no intention of overclocking, in reverse, I think to undervolt a bit. 3700X seems a bit more than 65w chip. So, I have read that NH-L9 struggles to keep the chip under 80 celcius degree. I was looking for a better cooler at the same height.It's enough at stock for sure because the 3700X is a 65W TDP. How much are you looking to overlock?
41.5 mm from the bottom of the case to the edge of the motherboard tray. The riser needs about 1 mm.How much vertical height is there in the Velka 3's power supply area? I know the FlexATX is 40mm tall, but is there an extra couple mm down there for say the Meanwell 400w RPS-400-12-C (43mm with case supposedly).