You can use the distro plate to distribute the water between the two chambers (cpu & gpu), no need for any tubing to bend from one chanber to the other...!
Pump is on distro plate, doing its pump thing...
Four ports each chamber
two short (one top, one bottom, for radiators)
two long (to & from components)
That is a lot of ports...!
Especially on the GPU side, which has a substantial portion of the distro plate taken up by the D5 pump...
What about a single 280x55mm radiator / dual 140x25mm fans exhausting up top & dual 140x25mm fans intaking from below...?
With a single radiator the flow could be distro > cpu > radiator > gpu > distro & repeat
Distro plate moves water from GPU side to CPU side
Radiator moves water from CPU side to GPU side
Only two ports needed per chamber...!
280x55mm radiator more than enough for TDPs up to 16C Ryzen / Radeon VII levels...!
Especially once Noctua releases the NF-A14x25 PWM Sterrox fans...!
And since it is a visible distro plate, maybe a flow indicator mounted within...?
Oh...! And will a PCIe 4.0 x16 compliant riser cable be included with this chassis (hopefully 3M)...?
Thanks...!