No one has mentioned the absolute first thing that your team must decide (after reading & understanding the rules of course). Come up with a strategy to win the game. Every design choice you make should come out of your team's strategy.
Last year, our team realized early on that balancing both goals on the bridge and having all four robots in the endzone was the key to winning. So we designed our robot to enable our alliance to easily accomplish that. Unfortunately, Beatty also knew the key to the game and came up with a better strategy
Mike