willCauseChainKill?
and GetTrustLevel?
I wouldn't bother with getTrustLevel, if someone adds killBrick to their own brick, and they dont want theyre brick killed, then its their own fault. Also it would mess up if you want anyone to kill the brick, say in a City RPG where you purchase a lot, and you want the baseplate to be deleted.
Also, add a checkbox or a list for enabling chain killing. Sometimes i'd want it.