Just found out myself... sad to see there was never anything in the official news updates about what is quite a major change.
I recognize that the laws of physics will naturally push us all to "Slab" or "Boom Tube" designs, and it's very disappointing that the designers have not given us any proper way to allow for a wider variety in ship design shape.
With stacking disallowed by default, this only makes a significant existing problem worse (overall ship design being overly restrictive in a creative game) in order to solve what's a minor issue (pvp purism).
EDIT: I realize my complaints above fall on already-deaf ears for the devs, but will we at least be able to add a "contains stacked blocks" flag to workshop design submissions?
Please, at least add this so those of us who wish to play with stacking enabled can freely share our designs without a quagmire.
