First Server Build Advice
For the motherboard have a look on ebay for Intel S5520HC, it's a workstation focused dual socket Xeon motherboard in a standard SSI EEB form factor so should fit every case that takes E-ATX but do check the measurements of both.
For RAM again look on ebay for Samsung ECC Registered, costs slightly more but allows you to surpass the UDIMM limitation if you need to without buying complete new set of RAM wasting what you have.
Make sure you put in a minimum of 3 RAM sticks per CPU, 6 in total, for optimal triple channel configuration. I would account for 8GB of RAM per VM, although 6GB or 4GB might be enough for some you can always reassign more to the VM doing UE4/Blender.
If you can do a proof of concept with any parts you already have since multiple GPU accelerated VMs for standard desktop usage doesn't always work optimally, might even pay for buy some super cheap $5-$10 GPUs and just test out what you are wanting to do in a full configuration but using cheaper parts. Not as a performance test but a usability and connectivity test.

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