You are welcome to look at the robot designs we share on EV3Lessons.com. There are several designs from various contributors. http://ev3lessons.com/robots.html
The FIRST Steps course for new coaches refers to Droid Bot 2.0. The build instructions are available on the same page linked above.
Regards,
Sanjay and Arvind
EV3Lessons.com Founders
FLL Team Not the Droids You Are Looking For