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That does not sound expensive... unreal engine is just a game engine and works well on most PCs.
However... do you have weird display requirements? Driving a single 4k projector is hard, but driving a grid of 4k displays goes into a world of stratospheric costs.
A lot of the PCs on this page will be just fine if driving a single display... but push the higher specs if it's a 4k display / projector: https://www.novatech.co.uk/pc/gaming-pc/
Multiple displays? Then it's a different question altogether... the gaming machine stays the same but you start looking at display solutions which come with very different price tags.
Basically: Unreal Engine uses a bit of CPU and then a lot of GPU... what you need from a GPU varies according to the resolution and quality you want to get to. If you slam the GPU to the highest, the price tag is high and then you also want to increase other parts of the machine (CPU and RAM and SSDs) just to support the GPU (think of it like a car, increase the engine and you increase lots of other things as they are balanced together).
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Velocio
It's a work thing, for an art show. An artist has made a simulation in the Unreal Engine and that computer will be the source. I'm aware it'll be very expensive, but who is good to go to in the UK? I have someone who can make it in NY, but if I can save the shipping and have it done here then that'd be nice.