If teams choose to expand after the match has begun, is there a horizontal limit that the robot must meet?
@robotguy that is 36 wide by 36 long
there is no height restriction after the start of the match
No, it is actually a point to point measurement per this Q&A. There is a difference, as a robot with a 40" horizontal arm can diagonally fit in a 36" x 36" square. So the rule is that no 2 points on the same horizontal plane of your robot can be longer than 36". Also no height limit after the start of the match as you said.