There is a fundamental problem that these are highly complex highly integrated system. The cell is totally structural and glued together in a sandwich that is l

There is a fundamental problem that these are highly complex highly integrated system. The cell is totally structural and glued together in a sandwich that is literally as hard as a brick. You simply can not replace individual cells or individual models. The level of replacement is a the whole battery pack. Anything else makes very little sense. Your model is basically, putting a box in a box in box and then adding a huge amount of complexity on all layers to make it possible to cheaply disassembly. You are gone have a far heavier car, that is far, far more complex to build and far more prone to actually breaking.