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I allready have all that stuff, except the coolermaster case and the 650w antec psu, but i got a lot of other retro and cool cases and psu's, and even homemade cases.

I see that you are thinking the pentium III way, I have a lot of  old p3 hardware think about 7 dual slot 1 motherboards and two dual socket 370 boards.
As soon as i make a powersupply for the 8264 i just got home, then will i ofcourse also have dual p3 1ghz, but i find it cooler to run p3 1ghz in slot 1 than in socket 370. Just think that the socket way is too boring and the slot 1 way is way more cooler.

If you can do it the slot 1 way will it be nice looking. i also got a voodoo 4500, i think it's an 64mb and it's with 3dfx fan. And for everything in the world, keep us updated with your nice project! cool seeing people still find it fun to build old hardware in modern cases.

My goal is to get a project with four P III Xeon 1ghz cpu's, but it's hard to find a "regular" ATX motherboard which can be mounted in my cases. It will look cool in with my Q3D aalchemy 8264 in it. But it wont be a monster since the card only have huge preformance increase with antialiasing, else do i guess the card perform like my voodoo 4500. Have to do some benchmarks wehn i get it up and running.

Okay, sounds really exciting, cant wait.
I just hope you dont use vacum tube cooling, cuz i allready have that strange idea XD

Oh, did almost get a heart attack XD cant wait

Ha ha XD you are crazy dude,  liquid cooling for those old cpu's XD ha ha. Nice looking IDE cables, and damm those red sleeved power cables are hot. Bring it to LAN and people will get big eyes, even if maybe most of them just think its a dual xeon setup XD
But i personally think that the sata controller isnt home in it, you should maybe go for scsi instead, but i guess that you maybe allready have planned to change it, also still wonder what for a part you was waiting to get home

I also got a pc with serius watercoolong, but it aint from that age XD Here is a facebook video a guy uploaded of my pc to  a LAN Party.
https://www.facebook.com/video.php?v=383258118546585&set=vb.175016342704098&type=2&theater¬if_t=like

Btw, now wehn  im looking at it again, what is the red pcb on the top of the psu...?