Here's a picture of the system I am currently working on. Cut and sized all cables. Not to happy with the sas cables but they don't block airflow from the drive vents.
Check and see if Heilind has any of the flat 3M cables in the connectors + lengths you need.
I will be using the air shroud with this one as I need to direct air to the AiCs. I still need to add a couple of Supermicro NVMe adapters and the cables before cleaning and closing it up for good.
If you have a lot of add-in cards, the HA versions of the chassis will be a lot better, if there is a HA version of that model chassis. The SC836 comes in regular and HA, but your chassis looks like a 2RU version. The non-HA versions have 3 fans in the fan wall, 2 of which are completely under the shroud and one completely outside. If you lose that one fan, you have no cooling at all for anything outside the shroud. The HA has 4 higher-airflow fans in the fan wall and a little more than one and a half fans are not under the shroud. The only downside to the HA is if you are adding the dual 2.5" rear drive bay - you'll have to route the power and data cables out through the side of the power supply area because there's a PDB backplane blocking the ability to route them more cleanly. This probably only matters if you are using an oversize motherboard - even EATX have a reasonable gap between the edge of the motherboard and the start of the power supply cage.
