I guess I could build a ram stack 4 high! Will that work?
Not with the current version of RamDisk.
I will soon post a version of RamDisk that supports multiple chips. This will allow you to create one large volume. I am testing with four chips but the design is only limited by the number of pins used for chip selects.
I am also developing a version for 256 KB FRAM chips. Four FRAM chips will have a capacity of 1 MB.