I found building 16 cells into two 8S batteries very time consuming.
Everything from drilling 1/4” copper flat and cutting it to busbar to match my cells width, to trying to find a case for 8S 280 ah cells which didn’t exist to building my own, and then securing them to the floor was extremely time consuming. Even the second time around, would be quicker but still slow.
I’d hate to do six times the work. At best, that would be days; at worst weeks,
All depends on times and needs.
I am thinking of two 16S battery packs for a project and am heavily leaning towards some pre-built battery pack.