Is there room for the PSU extension to plug in the SFX PSU? Was the modular connectors size and the cables accounted for to not collide with EPS, fan connectors? Some boards even have heatsinks there. Also at just 125mm without the PCI connector, will there be room for the power connector on the 3090 FE?Yes, the components are packed very tightly, I had to tinker:
3090FE with real (i hope) dimensions (really huge thing, some design changes need to be made) :