Robogamers made a video reviewing the Tetrix Kit of Parts as well as building both the tetrix ranger bot and the matrix bot. You can see the two side by side. Here are the links:
Robogamers tetrix kit:
https://www.youtube.com/watch?v=EDSCy-9WVfA
Tetrix Ranger bot:
https://www.youtube.com/watch?v=jnt3EVZaCxQ
Matrix Quick Start bot
https://www.youtube.com/watch?v=Hy4cswZ_Iqk
Some of the other videos may help out your new team members as well.
Hope it helps.