Great looking robot!
I love the antennas on top of the bot for visibility, I think it will help a lot.
If you are worried about your antennas extending outside of your frame perimeter, you could make them shorter and center justify them on the robot.
Have you considered what would happen if someone runs into the bot at the moment you pick up the boulder? it looks like it might escape out the top/sides.
It seems like you have good control when the boulders enter the robot though
I am really digging that shot, but you should watch out for ware and tear over the season as it may reduce the energy that you are able to transfer to the ball.