The 6100 is pretty thick, but to take the top cover off you have to bend those plastic tabs and those will break sooner or later.
With prices for working machine rising, we have seen some models get new motherboards manufactured, sooner or later we will see new cases as well (assuming 3D printing keeps getting faster and cheaper).
I assume that before I die people will have SE/30's where pretty much the only thing original might be the 68030 CPU.