Your wish is my command, sire.
External view, showing off the two rear exhausts and one rear intake. Note: I connect and disconnect the intake fan externally as that’s easier than doing it from the inside.
The 3D printed funnel is designed to reduce intake noise on the outside and to funnel outside air to just above the CPU Cooler. This air also helps cool the two SATADOMS just below the CPU.
The Flex-ATX board has a Cu CPU heat sink, with a dedicated blower on the heat sink as well as the HBA. The latter was hard to source. A 120mm blower at an angle bathes these active heat exchangers and the passive SLOG
Further forward, you can see the flexible lip I fashioned from duct tape to ensure there is minimal leakage past the HDD trays / tower and the side cover (see red arrows). It is somewhat flexible and doesn’t stick to the side cover.
Lastly, more duct tape between the case and the HDD tower to force all air through the tower as opposed to past it (green arrows). A matching set on the other side keeps air from leaking past that side also. Three 120mm Noctua Industrial fans up front make for nice air flow.