Yes it was possible! It worked up until the point I tried to install MultiBeast's Network Drivers - then - the black multi-language screen of death telling you to reboot...
Well, for one... it worked installing etc, had to boot using the iBoot Ivy Bridge Disc.
Installing 10.6.8 worked.
Everything installed fine, till I tried the selection to install all drivers because I got tired rebooting (every boot required the iBoot) after every single one by one driver install... time is running out so we binned it.
But I think if I had more time to play with the Mac Mini, I could find a way to use the 10.7 or 10.8 Kext Drivers on 10.6