Yes!! it is possible to use the Max11068 connected to an Arduino to read any number of cells ( upto 120 ).
There is no problem except that the most negative part of the battery pack is connected to the maxim gnd. All the rest are floating and the 11068 mux handles this perfectly. I have a system for an ecar that uses this chip and uses 112 cells. Nearly 400 volts!!
No need for relays. The documentation for the 11068 and the eval board 11068eval kit explain most of what you need to do. How you connect to the Arduino via the SDA and SCL outputs on the lowest max11068 using Ic2 or SMB depends on how you want to handle the data stream and where you are displaying the data. . I will publish code when I have it thoroughly tested. If anyone in this forum has done this please let me know and we can compare notes.