Haha...
Judging by the orientation of the memory riser cards (both facing up), it's clearly a 1,1 or 2,1 machine. CPUs? Probably two Woodcrest 5150s (2.66GHz).
The graphics card looks like a 7300 GT 256MB, NOT a GT 120 512MB.
Hard to tell from the low-res pictures, but the side of the front fan assembly has got some kind of dirt/grime or discoloration going on, as if the machine was used in a smoker's home.
I'm not quite sure if it's even possible to get 64GB of RAM to register in a 1,1/2,1 (never seen anyone try it). I guess in THEORY you could if the chipset and firmware allowed it and of course, you'd spend a fortune.
56k modem? Uh-uh... Apple did make a USB dongle modem offered around the time this machine was new. But never built-in.
About the only plausible spec listed here is perhaps the four 3TB hard drives. That's about $800-1000 worth of drives new.
But the funniest thing about this whole listing is the absolute lunacy in pricing. 8000 GBP? Wow... They must be high. You can get a brand new 12-core straight from Apple, even getting 64GB of their highly marked up RAM and come out for less than that. I certainly hope there's nobody stupid enough out there to buy that machine...