20s for the Demon - how low can I go? (big wheel haters don't look)

I like the big wheel look, rjsjea has the stance and rim size nailed. 19s look great, I like a 19/18 combo. BUT....for big wheels you have to have width on the rear set, if you run a 255/35/20 or something similar on the rears then don't bother. If you put the time in to mini-tub and spring relocate and can fit something like a 335 or 345 wide on 12" rim that would be killer. The tucked look is a 1000x better with steam rollers,,,,,and of course the power to smoke them at will!
Good luck with your build whatever route you choose.