Not that ive done this by any means but i can
imagine use of an end mill to carefully mill through each of the welds if one really wanted to tear this thing down. A lot of effort and.. requires the mill.
Honestly, as much as i like the idea of user serviceability in general I kinda feel like, unless there is some kind of guaranteed supply of compatible cells, that the only way you'd be messing with cells is to re-cell the entire thing with a new matched set. I'm more concerned about servicing 'stupid' failures like poor connections causing melting wiring, or a bad bms etc. Those are the kind of failures i perceive (perhaps wrongly?) as more likely, and those are possible just because of the screwed on lid. So i take the bolted lid as being probably 70+% of what i care about in 'serviceability'. Maybe it's an odd opinion.. not sure!