That's my plan. The secondary board is an old Socket7 thing with an AMD K6-2 in it. Best thing about this is low heat production and...
... all the needed peripherals are onboard. I won't have to line up the PCI cards because there won't be any.
The most complex part of the whole business is making everything look neat. Add an extensive watercooling system utilising 1/2" pipes to the main system and you've not got a lot of room to play with.
oh okay, that's convenient. My older computer has nearly a full load of PCI cards (two Voodoo 2s, ATA controller, 10/100 NIC, SBLive 5.1 that can emulate an SB16), as the motherboard dosn't have much in the way of onboard components.
The 1.4ghz Athlon C in it is like a furnace though. It idles at 57C or so and regularly passes 80C on load despite having a fairly good heatsink on it. It has actually burned a permanent impression on an older heatsink that was placed on it for two years, but this is apparently normal with this CPU.
The core is also chipped and dented in several places along its edge, but it strangely still works fine.