I don't think a regular sanke tap would fit, it's pretty tight in the sanyo 4912. In my sanke kegerator, I had to get a low profile coupler because there wasn't a lot of room in my fridge. If you have one like this I don't think you'd have a problem, because it probably wouldn't be much taller than the handles on the corny.
Also, a 6th barrel and a cornie keg or two cornies will fit in the Sanyo 4912, but not two 6th barrels or one 1/2 barrel.
That is truly a CO2 tank and dual regulators behind the kegs as well. A 6th barrel sits slightly lower than a cornie and allows for regulator adjustments rather easily.