Here is the legendary Hoojum Cubit 3 solid aluminium Mini-ITX case, just  just 147mm x 210mm x 210mm

Designed with a unique sliding tray system capable of accommodating various drives including multiple 2.5" HD/SSDs, 3.5" and DVD drives, each case was lovingly handmade of 2Kg of anodised Aluminium.

This one has been modified to accept a larger CPU cooling fan (see my other listings)

Along with the case, this listing includes:

ZOTAC GeForce 9300-ITX WiFi Mini ITX Motherboard 

Intel Core 2 DUO E5200 2.50GHz CPU 800FSB Socket LGA775 - BX80571E5200

4GB RAM: KVR800D2N6K2/4G kit of two 256M x. 64-bit (2GB) DDR2-800 CL6 SDRAM (Synchronous DRAM) memory modules. 

Pico PSU -150-XT/12.5A 150W AC-DC

Please note: these have been in storage and haven't been tested recently, so I don't know if they're functioning, but they might be offer a head start to anyone wanting a mini-itx project. In any case bid knowing that there is no guarantee or warranty and that you will need some pc building skill and other parts to make this a functional PC, as I cannot accept returns.