For cells with different manufacturers and capacity, placing them in 1S setup is an easier way to build a bank of battery.
As I mentioned earlier, having a protection board between each layer of cell or with cells from different sources. In this way, if a pair of cells is discharged faster (due to lower capacity), then the protection board cuts off the cells from the pack. If the voltage between each pair of cells is different, discharge between cells can be hazardous. If the current between layer is more than allowed, for example, 3A, then the board isolates that pair of cells as well.