don't have a lot of time......but i'll answer some of the questions.
is it top-heavy?
the shooter and turret combo weigh 16lbs. heavy? yes, prohibitively heavy, obviously not!
why omni casters? they are powered, and they have less scrubbing friction that pneumatic tires.....it is a nice middle ground. those omni casters still provide tons of forward motive force!!!!!
why two fp motors on the tube? we run both belt independently depending on the particular operation at hand. sometimes we're taking balls up, sometimes we're taking balls out, and sometimes we're just spinning them in the tube.
the caption on this photo says SOME of our major components. this is a 2/3 robot.
thanks for the comments.