Standard base frame less.
Control C
Apply lock dado construction via global settings.
Change KDA RTA's
Take bottom shelf into part editor.
Put a rectangular geometry onto the back edge overlapping the back edge.
Pointer, Right click, Cut pocket using closed contour.
Cut through.
Return to main, keep changes.
Take bottom shelf into constraints manager.
Apply the 3 constraints as in the picture.
resizing the cabinet makes it more unstable.
I think its something to do with the cutout overlapping the dados?
I also played around with the top shelf.
It seems to behave slightly differently.
Once you go past the self intersecting constraints sizes (the cabinet size where the constraints limit the cabinet size), you get error messages and it becomes corrupted.
Mark