I would actually really love to get a proper cab setup for retro gaming, maybe with a Pi or something under the hood. Never have the time at the moment though - maybe one day I'll start a thread and pick your brains about it
In a few years a raspPi will be bossing it, they're already pretty good (PC solutions currently quite a lot better) But the Pi will get there, RPi4 compatibility is proving very slow due to new graphics hardware.
Alas also in a few years unless something changes "proper" Cabs, ie with CRTs will be more expensive.
You know a lot of people are building using a MiSTER (https://www.retrorgb.com/mister.html) with different cores ?
My mate has one and he loves it, they released cave cores and DoDonPachi for it a few weeks back which really got my attention
He has a net city cab with VGA so that works, annoyingly the target cabs I have in mind are all JAMMA only and a suitable solution isn't available yet but they're working on it, only a mater of time
https://www.youtube.com/watch?v=PVk_Z1g1qb8I'm keen to get one when it's out as RPI4 still is pretty shonky emulation wise, but it's passable.