Ri3D Team Cockamamie Robot Reveal 2016

[Chak]

Wow! When I heard someone at kickoff say that a low-bar high-goal shooter is impossible, I knew someone else would do it.
Does the drivetrain get over any other defenses, or is this bot focused on the low bar to shooting path? If the drivetrain has the ability to get over other defenses, I would be interested in knowing the wheels' size and the center wheel's drop.
Looks like the intake is spring-loaded or something. Does that improve performance compared to a static wheel?
I can't figure out how that catapult works; the catapult doesn't seem to be connected to anything but its shaft. Is the potential energy stored somewhere else, then transmitted to that shaft?