I get what you're thinking about with the large capacity cells and assuming the cells are a near enough match it is my preferred way to build a DC supply when a packaged option just isn't best.
Single cell options are great when you can connect them with buss bars or nice cable stubs designed to minimize impact or role in the charge/discharge behavior. I suggest any plan to separate those cells by distance will disrupt "balance". How much sort of depends but my bet is you'd be unhappy in the end.
I also suggest that a remote location as a simple parallel interconnect, would be my choice and bet for long term success. Certainly open to an argument to sway me otherwise
In reference to 6V in series ... or as an example ... Think about optimal long term use providing usable 12V, the series jumper wire between them must be as optimal as the internal interconnects. Since that's not likely, the use of GC batteries for 12V is a technical compromise where the low cost outweighs the negative impact. For this topic, look up interconnect recommendations.
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