[MrForbes]

There are three possible weight/height robot starting configurations. <R09> says ou have to pick one, and stick with it, throught the whole weekend. For example, if you build a 110 lb 5ft high robot, you can't add weight to it after inspection, even if you reduce it's height to 4 feet or less.

The 72" x 72" "virtual box" rule applies to robots after play has begun, your robot can expand to any size that will fit within a 72" wide by 72" long by as high as the ceiling box. But you'll have to fold it up again before the beginning of the next match.

also it can be any size when it is in the home zone (although the home zone is only 8 feet by 26 feet, so that is the effective size limit there)