I can beat that! I've ran it with a OS 2 68000 A600 with a 2MB SRAM card, I did for about a year anyway, before getting a Kipper 4MB upgrade. Had 2MB Chip as well. A number of slaves wouldn't work with the 68000 for which the original games were designed, but I think they've been slowly fixing that.
I even ran it at first with just 2MB Chip, but 2-disk games were very slow with the loading, small games were fine. But honestly, 4MB fast and 2MB Chip is the minimum I'd run it on (along with a 68020 or above due to the slaves which weren't 68000 tested). 
Yeah you get far with just a 4MB SRAM card, ive ran most multidisk games on a A600 with 4MB SRAM in the past, as long as I removed the ;preload tag on big games most worked without issues
