Looks like blueprints in ue5 to me

Rctestflight

Cranktown city

This old Tony

And a few more but those are my favorites.

War

Pc atx 24 pin breakout board

Cheap esc for bldc ( but those yellow extra cheap ones have a tendency to burn up on high duty cycle loads )

Cheap bldc too, I use one plus a 3d printed fan + shroud to cool nvidia tesla gpus and another two to vent in/out garage door windows in summer

So many sensors

E ink screens plus esp32 or other mcu / sbc

Small touchscreens plus sbc for diy smart stuff

Cheap aluminum extrusion and fixings ( ryobi scroll saw is a relatively quiet and controlled way to deal with smaller stuff like 2020)

Cheap bms and mppt solar bois

Cheap rgb led stuff, I’m partial to the water proof silicone stuff, easy to pair with an esp32

A lot of tat is similarly priced on Amazon and the likes. Always worth a double check before defaulting to ali

5 hubs deep and 127 devices per usb controller (not port)

To confuse this more many usb3 or newer controllers won’t handle more than 32 devices.

Now add to that most 7 port usb hubs are actually 2x 4 port hubs.

You may be starting to see why it is so hard to definitively say if a certain usb setup will work or not without testing the actual hardware.

Side note, a lot of usb devices even count as 2 devices due to hw encryption chips, like wd external hard drives.