Look at the picture, the bottom of the sparrow is designed with a beam, which will affect the height of the gpu like below.Also, if using the HDplex Dc-ATX + AC-DC combo from HDPlex, it might be possible to mount the DC-ATX vertical, on the motherboard side where the FlexPSU would be. And the 180 mm long AC-DC unit horizontally, below the GPU? Where the extension cable for the psu is now.
Any chance you could take measurements on the available space below the GPU side, Cooj? Because if that works, it would mean the GPU in the MQ5 could also extend the full 219 mm. Like in the MQ6.