i made this one a while ago. it has the same movement characteristics as the swerve bot without all the motors and swerve drives. with three motors this can move in any direction, change direction without turning and also turn on its own axis. check it out.
looks nice, have you written code or are you driving it with just the joysticks? i tried writting code for kiwi drives but its hard because the 2 of them have to go at 1/3 speed.