Well, this system is still being used, adjusted from time to time and waiting for the PSU box. My brother in law was at a birthday a few days ago and mentioned it himself, so I hope he'll start working on it soon
There are a few updates, and I'll show what it looks like at the moment:
First of all, this is what the system looks like right now (the desk light really helps at night):
The GPU's, from left to right: 3060, 3070Ti, 2080Super, 3080Ti. Soon the air cooled 3090 will join them:
A new power strip, the cable from the old one was a bit warm with 5 GPU's pulling close to 2kWh.. (I thought I cleaned up the cables, but it still looks like a "rat's nest" )
An extra fan with a DimasTech FlexFan 140 mount to blow some air on the motherboard:
New caster wheels, the old ones are plastic and smaller diameter which makes it hard to roll the system:
I'm thinking about making a diamond plate between the bottom profiles so it has some sort of storage, maybe the sides and back too which will give it more of a cabinet look. The bottom is easy, the plate will rest on the caster wheel mounting plates. The sides and back will be a bit harder to attach. If the aluminium diamond plate is sandblasted it'll look almost the same as the profiles.
That's it for now, the system is running great *knocks on wood* and has been a workhorse as far as folding, benchmarking/overclocking and testing/switching hardware goes.