Well done, shows the basics which is so important for many folks.
I would suggest one addition "disclaimer" as such. Have you ever tried to pick up a 16 Cell Pack ? Now if it's 50AH cells it's one thing but 200H cells and above, you are dealing with serious weight.
Example. the EVE 280AH cells weight in at 5.2 Kg / 11.5 LBS each cell
8 cells = 41.2Kg/93 Lbs / 16 cells = 82.4Kg/184 LBS Add the weight of Box and bits it becomes unwieldy quickly.
Please take a look at the page that talks about bus bars.... As you get larger parallel groupings, you need to pay attention to minimizing the voltage drops across the bus bars.