Mods that I planed:
1. Internal USB Hub
I went with B550i over X570i because I really want front panel USBC and 2.5GBE (and X570 wasn't in stock when I pulled the trigger). However, B550i simply just has too few USB ports to be practical.
The plan is to use a 7 port USB 3.0 hub and connected it to the internal front panel USB 3.0 port on the mother board with a scuffed cable setup (USB 3.0 19p > 2x USB 3.0 19p > USB 3.0 Type A > USB 3.0 Micro)
2. Internal DP and HDMI extension + 12V DC port
Same idea as the first mod but with DP and HDMI port. I will still be using the regular DP port with a 90 degree DP cable at home, but those two ports on the back mean I won't need to worry about it when I travel with this build (Whenever that becomes relevant again).
(I don't have the case in hand yet but I bought a 0.25m extension for HDMI and 0.3m extension for DP)
For the DC port, it will be used to power VR headsets like my Valve Index. There's an
existing kit for this purpose already but it's been out of stock so I will just make one my own. It will be powered from a SATA power port and I can also use the 5v from that port to power my USB hub.
3. Heat Sink on the back of 3090
3090 gets really hot on the back because of that juicy VRAM and sandwich layout of the Meshlicious surely doesn't help this situation either. To help it cools I will be using the 4 slot configuration, slap some heatsink on the back of the 3090, and then offset the GPU by 1 slot.
I'm not sure how effective this will be so I bought two types of heatsinks.
First, one is a purely passive heatsink (120x120x20mm) and relies on the airflow from the radiator fan, but I think power cables might block the airflow and render the heatsink useless.
Another one is an active heat sink with an 8cm fan on top (80x80x15mm total) and will try to pull air in from the back of the PSU.
4. Custom cable
Need to make sure the current PSU won't cause a Kaboom and need to measure the case. Will update this later.
5. ██████████
Will update this later once the case is here and some other factors are met.